diff --git a/programs/arp/main.c b/programs/arp/main.c
index cfcff464959..e71047e482c 100644
--- a/programs/arp/main.c
+++ b/programs/arp/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(arp);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/aspnet_regiis/main.c b/programs/aspnet_regiis/main.c
index 2560ae59486..d1bf4368b8a 100644
--- a/programs/aspnet_regiis/main.c
+++ b/programs/aspnet_regiis/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(aspnet_regiis);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/attrib/attrib.c b/programs/attrib/attrib.c
index 73e2f60ce82..e7fe4687376 100644
--- a/programs/attrib/attrib.c
+++ b/programs/attrib/attrib.c
@@ -244,7 +244,7 @@ static BOOL ATTRIB_processdirectory(const WCHAR *rootdir, const WCHAR *filespec,
     return found;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     WCHAR name[MAX_PATH];
     WCHAR *namepart;
diff --git a/programs/cabarc/cabarc.c b/programs/cabarc/cabarc.c
index 66630db0f81..5337b1e0095 100644
--- a/programs/cabarc/cabarc.c
+++ b/programs/cabarc/cabarc.c
@@ -591,7 +591,7 @@ static void usage( void )
         "  -v       More verbose output\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const WCHAR noneW[] = {'n','o','n','e',0};
     static const WCHAR mszipW[] = {'m','s','z','i','p',0};
diff --git a/programs/cacls/cacls_main.c b/programs/cacls/cacls_main.c
index eebd6d0d4e4..0c2e9d1d017 100644
--- a/programs/cacls/cacls_main.c
+++ b/programs/cacls/cacls_main.c
@@ -24,7 +24,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(cacls);
 
-int main(int argc, char** argv)
+int __cdecl main(int argc, char** argv)
 {
     int i;
 
diff --git a/programs/cmd/wcmdmain.c b/programs/cmd/wcmdmain.c
index 8a68c0c2df8..5cad22b7ee4 100644
--- a/programs/cmd/wcmdmain.c
+++ b/programs/cmd/wcmdmain.c
@@ -2419,7 +2419,7 @@ void WCMD_free_commands(CMD_LIST *cmds) {
  * winmain().
  */
 
-int wmain (int argc, WCHAR *argvW[])
+int __cdecl wmain (int argc, WCHAR *argvW[])
 {
   int     args;
   WCHAR  *cmdLine = NULL;
diff --git a/programs/conhost/conhost.c b/programs/conhost/conhost.c
index 3ef40baeb86..706cb5e9836 100644
--- a/programs/conhost/conhost.c
+++ b/programs/conhost/conhost.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(conhost);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/dism/dism.c b/programs/dism/dism.c
index 86d5d2e6a3a..36b7653dd0c 100644
--- a/programs/dism/dism.c
+++ b/programs/dism/dism.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(dism);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/dpnsvr/main.c b/programs/dpnsvr/main.c
index 6041cbc002a..cabc8a6c700 100644
--- a/programs/dpnsvr/main.c
+++ b/programs/dpnsvr/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(dpnsvr);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/eject/eject.c b/programs/eject/eject.c
index 09922beb1e7..0a081cfdf56 100644
--- a/programs/eject/eject.c
+++ b/programs/eject/eject.c
@@ -145,7 +145,7 @@ static void parse_options( int *argc, char *argv[] )
     }
 }
 
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     parse_options( &argc, argv );
 
diff --git a/programs/expand/expand.c b/programs/expand/expand.c
index cf7eb202a21..fe2b4a1c81e 100644
--- a/programs/expand/expand.c
+++ b/programs/expand/expand.c
@@ -89,7 +89,7 @@ static BOOL option_equal(LPCSTR str1, LPCSTR str2)
     return !lstrcmpA( str1 + 1, str2 );
 }
 
-int main(int argc, char *argv[])
+int __cdecl main(int argc, char *argv[])
 {
     int ret = 0;
     char infile[MAX_PATH], outfile[MAX_PATH], actual_name[MAX_PATH];
diff --git a/programs/fc/fc.c b/programs/fc/fc.c
index ba3b04bda2a..84ce886b9a2 100644
--- a/programs/fc/fc.c
+++ b/programs/fc/fc.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(fc);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/find/find.c b/programs/find/find.c
index 9d7aecd4021..0c8ba1fcd71 100644
--- a/programs/find/find.c
+++ b/programs/find/find.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(find);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/findstr/main.c b/programs/findstr/main.c
index de5de33c35d..d25e1965f6e 100644
--- a/programs/findstr/main.c
+++ b/programs/findstr/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(findstr);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/fsutil/main.c b/programs/fsutil/main.c
index 2bce87edc84..eb4e3412976 100644
--- a/programs/fsutil/main.c
+++ b/programs/fsutil/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(fsutil);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/hostname/hostname.c b/programs/hostname/hostname.c
index 627d182773b..0738e718e11 100644
--- a/programs/hostname/hostname.c
+++ b/programs/hostname/hostname.c
@@ -118,7 +118,7 @@ static int display_computer_name(void)
     return 0;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     if (argc > 1)
     {
diff --git a/programs/icacls/icacls_main.c b/programs/icacls/icacls_main.c
index 8f93a97309e..2e225850fef 100644
--- a/programs/icacls/icacls_main.c
+++ b/programs/icacls/icacls_main.c
@@ -25,7 +25,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(icacls);
 
-int main(int argc, char** argv)
+int __cdecl main(int argc, char** argv)
 {
     int i;
 
diff --git a/programs/icinfo/icinfo.c b/programs/icinfo/icinfo.c
index 489e646f3d2..cbf7c675b03 100644
--- a/programs/icinfo/icinfo.c
+++ b/programs/icinfo/icinfo.c
@@ -54,7 +54,7 @@ static int WINAPIV mywprintf(const WCHAR *format, ...)
     return res ? nOut : 0;
 }
 
-int wmain(int argc, WCHAR* argv[])
+int __cdecl wmain(int argc, WCHAR* argv[])
 {
     int i, n=0,doabout=0,doconfigure=0;
 
diff --git a/programs/ipconfig/ipconfig.c b/programs/ipconfig/ipconfig.c
index adb3f8d3018..1823d482e2a 100644
--- a/programs/ipconfig/ipconfig.c
+++ b/programs/ipconfig/ipconfig.c
@@ -374,7 +374,7 @@ static void print_full_information(void)
     }
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     static const WCHAR slashHelp[] = {'/','?',0};
     static const WCHAR slashAll[] = {'/','a','l','l',0};
diff --git a/programs/lodctr/lodctr_main.c b/programs/lodctr/lodctr_main.c
index e6838736f5a..04623753913 100644
--- a/programs/lodctr/lodctr_main.c
+++ b/programs/lodctr/lodctr_main.c
@@ -19,7 +19,7 @@
 #include <windows.h>
 #include <loadperf.h>
 
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     return LoadPerfCounterTextStringsW(GetCommandLineW(), FALSE);
 }
diff --git a/programs/mofcomp/mofcomp.c b/programs/mofcomp/mofcomp.c
index f5c1e916eee..d6034ef7843 100644
--- a/programs/mofcomp/mofcomp.c
+++ b/programs/mofcomp/mofcomp.c
@@ -23,7 +23,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(mofcomp);
 
-int wmain( int argc, const WCHAR *argv[] )
+int __cdecl wmain( int argc, const WCHAR *argv[] )
 {
     WINE_FIXME("stub\n");
     return 0;
diff --git a/programs/msidb/main.c b/programs/msidb/main.c
index 2a3458ef340..ceca6df0fe7 100644
--- a/programs/msidb/main.c
+++ b/programs/msidb/main.c
@@ -615,7 +615,7 @@ static int export_tables( struct msidb_state *state )
     return 1;
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     struct msidb_state state;
     int i, n = 1;
diff --git a/programs/msinfo32/main.c b/programs/msinfo32/main.c
index 17515275fce..6c307853301 100644
--- a/programs/msinfo32/main.c
+++ b/programs/msinfo32/main.c
@@ -24,7 +24,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msinfo);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
     WCHAR system_info[64];
diff --git a/programs/net/net.c b/programs/net/net.c
index b3643698680..ae38c3a8a6a 100644
--- a/programs/net/net.c
+++ b/programs/net/net.c
@@ -294,7 +294,7 @@ static BOOL arg_is(const WCHAR* str1, const WCHAR* str2)
     return CompareStringW(LOCALE_USER_DEFAULT, NORM_IGNORECASE, str1, -1, str2, -1) == CSTR_EQUAL;
 }
 
-int wmain(int argc, const WCHAR* argv[])
+int __cdecl wmain(int argc, const WCHAR* argv[])
 {
     static const WCHAR helpW[]={'h','e','l','p',0};
     static const WCHAR shelpW[]={'/','h','e','l','p',0};
diff --git a/programs/netsh/netsh.c b/programs/netsh/netsh.c
index 1ea3ecf231c..4e52b39741e 100644
--- a/programs/netsh/netsh.c
+++ b/programs/netsh/netsh.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(netsh);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/netstat/netstat.c b/programs/netstat/netstat.c
index b3320204b4d..563896629c9 100644
--- a/programs/netstat/netstat.c
+++ b/programs/netstat/netstat.c
@@ -348,7 +348,7 @@ static NETSTATPROTOCOLS NETSTAT_get_protocol(WCHAR name[])
     return PROT_UNKNOWN;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     WSADATA wsa_data;
     BOOL output_stats = FALSE;
diff --git a/programs/ngen/ngen_main.c b/programs/ngen/ngen_main.c
index c3793409f8f..024d8b1a762 100644
--- a/programs/ngen/ngen_main.c
+++ b/programs/ngen/ngen_main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(ngen);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/ping/ping_main.c b/programs/ping/ping_main.c
index 5022fe27e7c..51246e3f5bf 100644
--- a/programs/ping/ping_main.c
+++ b/programs/ping/ping_main.c
@@ -45,7 +45,7 @@ static void usage(void)
            "    -l  Length of send buffer.\n");
 }
 
-int main(int argc, char** argv)
+int __cdecl main(int argc, char** argv)
 {
     unsigned int n = 4, i, w = 4000, l = 32;
     int res;
diff --git a/programs/plugplay/main.c b/programs/plugplay/main.c
index ea8e078ee74..73bf46d6f99 100644
--- a/programs/plugplay/main.c
+++ b/programs/plugplay/main.c
@@ -87,7 +87,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     WINE_TRACE( "service stopped\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const SERVICE_TABLE_ENTRYW service_table[] =
     {
diff --git a/programs/powershell/main.c b/programs/powershell/main.c
index d39cdc032e7..eb9a64ff0ec 100644
--- a/programs/powershell/main.c
+++ b/programs/powershell/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(powershell);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/presentationfontcache/main.c b/programs/presentationfontcache/main.c
index de5e323b7b3..694ad792dbf 100644
--- a/programs/presentationfontcache/main.c
+++ b/programs/presentationfontcache/main.c
@@ -87,7 +87,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     WINE_TRACE( "service stopped\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const SERVICE_TABLE_ENTRYW service_table[] =
     {
diff --git a/programs/reg/reg.c b/programs/reg/reg.c
index 987a556c869..a1edd226ace 100644
--- a/programs/reg/reg.c
+++ b/programs/reg/reg.c
@@ -943,7 +943,7 @@ static enum operations get_operation(const WCHAR *str, int *op_help)
     return REG_INVALID;
 }
 
-int wmain(int argc, WCHAR *argvW[])
+int __cdecl wmain(int argc, WCHAR *argvW[])
 {
     int i, op, op_help, ret;
     BOOL show_op_help = FALSE;
diff --git a/programs/regasm/main.c b/programs/regasm/main.c
index a3243c3f6fd..33bee57bb93 100644
--- a/programs/regasm/main.c
+++ b/programs/regasm/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(regasm);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/regini/main.c b/programs/regini/main.c
index a8ad6548afc..4b9cbd8bb5b 100644
--- a/programs/regini/main.c
+++ b/programs/regini/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(regini);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/regsvcs/main.c b/programs/regsvcs/main.c
index 570686d6b3c..3a0e5217247 100644
--- a/programs/regsvcs/main.c
+++ b/programs/regsvcs/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(regsvcs);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/regsvr32/regsvr32.c b/programs/regsvr32/regsvr32.c
index 77a839e475a..4aa3f7d5c1f 100644
--- a/programs/regsvr32/regsvr32.c
+++ b/programs/regsvr32/regsvr32.c
@@ -211,7 +211,7 @@ static WCHAR *parse_command_line(WCHAR *command_line)
     return NULL;
 }
 
-int wmain(int argc, WCHAR* argv[])
+int __cdecl wmain(int argc, WCHAR* argv[])
 {
     int             i, res, ret = 0;
     BOOL            CallRegister = TRUE;
diff --git a/programs/rpcss/rpcss_main.c b/programs/rpcss/rpcss_main.c
index 5899adb5116..6d24ccbc072 100644
--- a/programs/rpcss/rpcss_main.c
+++ b/programs/rpcss/rpcss_main.c
@@ -148,7 +148,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     TRACE( "service stopped\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const SERVICE_TABLE_ENTRYW service_table[] =
     {
diff --git a/programs/sc/sc.c b/programs/sc/sc.c
index 52c72673d25..1976c38a782 100644
--- a/programs/sc/sc.c
+++ b/programs/sc/sc.c
@@ -212,7 +212,7 @@ static void usage( void )
     exit( 1 );
 }
 
-int wmain( int argc, const WCHAR *argv[] )
+int __cdecl wmain( int argc, const WCHAR *argv[] )
 {
     static const WCHAR createW[] = {'c','r','e','a','t','e',0};
     static const WCHAR descriptionW[] = {'d','e','s','c','r','i','p','t','i','o','n',0};
diff --git a/programs/schtasks/schtasks.c b/programs/schtasks/schtasks.c
index 980093e7331..2ffc241153d 100644
--- a/programs/schtasks/schtasks.c
+++ b/programs/schtasks/schtasks.c
@@ -345,7 +345,7 @@ static int delete_command(int argc, WCHAR *argv[])
     return 0;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i, ret = 0;
 
diff --git a/programs/sdbinst/main.c b/programs/sdbinst/main.c
index ce676609219..2fbc1fab3f7 100644
--- a/programs/sdbinst/main.c
+++ b/programs/sdbinst/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(sdbinst);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/secedit/main.c b/programs/secedit/main.c
index 597db5afba5..ea3e09a564f 100644
--- a/programs/secedit/main.c
+++ b/programs/secedit/main.c
@@ -16,7 +16,7 @@
 
 #include <stdlib.h>
 
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     return 0;
 }
diff --git a/programs/servicemodelreg/main.c b/programs/servicemodelreg/main.c
index 8c89464d9e1..a6b4443d916 100644
--- a/programs/servicemodelreg/main.c
+++ b/programs/servicemodelreg/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(svcmodelreg);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/services/services.c b/programs/services/services.c
index 968be3533b8..d9c4e484e42 100644
--- a/programs/services/services.c
+++ b/programs/services/services.c
@@ -1267,7 +1267,7 @@ static void load_registry_parameters(void)
     RegCloseKey( key );
 }
 
-int main(int argc, char *argv[])
+int __cdecl main(int argc, char *argv[])
 {
     static const WCHAR service_current_key_str[] = { 'S','Y','S','T','E','M','\\',
         'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
diff --git a/programs/shutdown/main.c b/programs/shutdown/main.c
index 49f8d24f4d5..00fb508881d 100644
--- a/programs/shutdown/main.c
+++ b/programs/shutdown/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(shutdown);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/spoolsv/main.c b/programs/spoolsv/main.c
index 169b80233b7..8fe37f2354f 100644
--- a/programs/spoolsv/main.c
+++ b/programs/spoolsv/main.c
@@ -88,7 +88,7 @@ static void WINAPI serv_main(DWORD argc, LPWSTR *argv)
     WINE_TRACE( "service stopped\n" );
 }
 
-int main(int argc, char **argv)
+int __cdecl main(int argc, char **argv)
 {
     static const SERVICE_TABLE_ENTRYW servtbl[] = {
         {spoolerW, serv_main},
diff --git a/programs/start/start.c b/programs/start/start.c
index 7668330c7f8..2a2c30022c3 100644
--- a/programs/start/start.c
+++ b/programs/start/start.c
@@ -350,7 +350,7 @@ static BOOL search_path(const WCHAR *firstParam, WCHAR **full_path)
     return FALSE;
 }
 
-int wmain (int argc, WCHAR *argv[])
+int __cdecl wmain (int argc, WCHAR *argv[])
 {
 	SHELLEXECUTEINFOW sei;
 	DWORD creation_flags;
diff --git a/programs/subst/main.c b/programs/subst/main.c
index 5af524d150d..7bcabf005b1 100644
--- a/programs/subst/main.c
+++ b/programs/subst/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(subst);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/svchost/svchost.c b/programs/svchost/svchost.c
index 704510407ca..30c35616990 100644
--- a/programs/svchost/svchost.c
+++ b/programs/svchost/svchost.c
@@ -332,7 +332,7 @@ static BOOL LoadGroup(PWCHAR group_name)
 }
 
 /* Load svchost group specified on the command line via the /k option */
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int option_index;
 
diff --git a/programs/systeminfo/main.c b/programs/systeminfo/main.c
index e7bb30e2e4f..b633134a393 100644
--- a/programs/systeminfo/main.c
+++ b/programs/systeminfo/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(systeminfo);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/taskkill/taskkill.c b/programs/taskkill/taskkill.c
index 5f1993bfca1..600bab14fde 100644
--- a/programs/taskkill/taskkill.c
+++ b/programs/taskkill/taskkill.c
@@ -525,7 +525,7 @@ static BOOL process_arguments(int argc, WCHAR *argv[])
     return TRUE;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int status_code = 0;
 
diff --git a/programs/tasklist/tasklist.c b/programs/tasklist/tasklist.c
index a0efa634425..fd03f50dae6 100644
--- a/programs/tasklist/tasklist.c
+++ b/programs/tasklist/tasklist.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(tasklist);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/termsv/main.c b/programs/termsv/main.c
index de903501eb0..eb79d17f005 100644
--- a/programs/termsv/main.c
+++ b/programs/termsv/main.c
@@ -87,7 +87,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     WINE_TRACE( "service stopped\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const SERVICE_TABLE_ENTRYW service_table[] =
     {
diff --git a/programs/uninstaller/main.c b/programs/uninstaller/main.c
index 5e48306a38f..38a9e668305 100644
--- a/programs/uninstaller/main.c
+++ b/programs/uninstaller/main.c
@@ -157,7 +157,7 @@ static void RemoveSpecificProgram(WCHAR *nameW)
 }
 
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     LPCWSTR token = NULL;
     static const WCHAR helpW[] = { '-','-','h','e','l','p',0 };
diff --git a/programs/unlodctr/unlodctr_main.c b/programs/unlodctr/unlodctr_main.c
index bc6a966c88f..4eb44c1acd2 100644
--- a/programs/unlodctr/unlodctr_main.c
+++ b/programs/unlodctr/unlodctr_main.c
@@ -19,7 +19,7 @@
 #include <windows.h>
 #include <loadperf.h>
 
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     return UnloadPerfCounterTextStringsW(GetCommandLineW(), FALSE);
 }
diff --git a/programs/wevtutil/main.c b/programs/wevtutil/main.c
index bd95d1f6cf7..f108df0d53a 100644
--- a/programs/wevtutil/main.c
+++ b/programs/wevtutil/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wevtutil);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/winedevice/device.c b/programs/winedevice/device.c
index f4ebad2f2d0..0755caaafb0 100644
--- a/programs/winedevice/device.c
+++ b/programs/winedevice/device.c
@@ -141,7 +141,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     CloseHandle( stop_event );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     SERVICE_TABLE_ENTRYW service_table[2];
 
diff --git a/programs/winemsibuilder/main.c b/programs/winemsibuilder/main.c
index 71fd1fdc1c8..e6c1a4d0f79 100644
--- a/programs/winemsibuilder/main.c
+++ b/programs/winemsibuilder/main.c
@@ -254,7 +254,7 @@ static void show_usage( void )
     );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     if (argc < 3 || argv[1][0] != '-')
     {
diff --git a/programs/winetest/main.c b/programs/winetest/main.c
index a6874c2d5b1..60cb49d1399 100644
--- a/programs/winetest/main.c
+++ b/programs/winetest/main.c
@@ -1237,7 +1237,7 @@ usage (void)
 " -x DIR    Extract tests to DIR (default: .\\wct) and exit\n");
 }
 
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     BOOL (WINAPI *pIsWow64Process)(HANDLE hProcess, PBOOL Wow64Process);
     char *logname = NULL, *outdir = NULL;
diff --git a/programs/winevdm/winevdm.c b/programs/winevdm/winevdm.c
index bde85a74a6a..4852e5fc728 100644
--- a/programs/winevdm/winevdm.c
+++ b/programs/winevdm/winevdm.c
@@ -486,7 +486,7 @@ static void usage(void)
 /***********************************************************************
  *           main
  */
-int main( int argc, char *argv[] )
+int __cdecl main( int argc, char *argv[] )
 {
     DWORD count;
     HINSTANCE16 instance;
diff --git a/programs/winmgmt/main.c b/programs/winmgmt/main.c
index 283f26e0f25..8b262d00f3b 100644
--- a/programs/winmgmt/main.c
+++ b/programs/winmgmt/main.c
@@ -87,7 +87,7 @@ static void WINAPI ServiceMain( DWORD argc, LPWSTR *argv )
     TRACE( "service stopped\n" );
 }
 
-int wmain( int argc, WCHAR *argv[] )
+int __cdecl wmain( int argc, WCHAR *argv[] )
 {
     static const SERVICE_TABLE_ENTRYW service_table[] =
     {
diff --git a/programs/wmic/main.c b/programs/wmic/main.c
index e20b1f8c107..f31a69a4241 100644
--- a/programs/wmic/main.c
+++ b/programs/wmic/main.c
@@ -265,7 +265,7 @@ done:
     return ret;
 }
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     static const WCHAR getW[] = {'g','e','t',0};
     static const WCHAR quitW[] = {'q','u','i','t',0};
diff --git a/programs/wmplayer/main.c b/programs/wmplayer/main.c
index 899835f41a0..2ab2d28ae28 100644
--- a/programs/wmplayer/main.c
+++ b/programs/wmplayer/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wmplayer);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/wuauserv/main.c b/programs/wuauserv/main.c
index 31df299e90e..8b360131112 100644
--- a/programs/wuauserv/main.c
+++ b/programs/wuauserv/main.c
@@ -89,7 +89,7 @@ static void WINAPI serv_main(DWORD argc, LPWSTR *argv)
     WINE_TRACE( "service stopped\n" );
 }
 
-int main(int argc, char **argv)
+int __cdecl main(int argc, char **argv)
 {
     static const SERVICE_TABLE_ENTRYW servtbl[] =
     {
diff --git a/programs/wusa/main.c b/programs/wusa/main.c
index aa7a38fe178..c3e3dfd38ce 100644
--- a/programs/wusa/main.c
+++ b/programs/wusa/main.c
@@ -20,7 +20,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wusa);
 
-int wmain(int argc, WCHAR *argv[])
+int __cdecl wmain(int argc, WCHAR *argv[])
 {
     int i;
 
diff --git a/programs/xcopy/xcopy.c b/programs/xcopy/xcopy.c
index 0d31d7c7d91..f50bb7791c2 100644
--- a/programs/xcopy/xcopy.c
+++ b/programs/xcopy/xcopy.c
@@ -1087,7 +1087,7 @@ static int XCOPY_ProcessDestParm(WCHAR *supplieddestination, WCHAR *stem, WCHAR
 
      Processes the args, and drives the actual copying
    ========================================================================= */
-int wmain (int argc, WCHAR *argvW[])
+int __cdecl wmain (int argc, WCHAR *argvW[])
 {
     int     rc = 0;
     WCHAR   suppliedsource[MAX_PATH] = {0};   /* As supplied on the cmd line */