diff --git a/dlls/advpack/tests/advpack.c b/dlls/advpack/tests/advpack.c
index 9cf1e8ab80e..a60d81e9b1e 100644
--- a/dlls/advpack/tests/advpack.c
+++ b/dlls/advpack/tests/advpack.c
@@ -185,7 +185,7 @@ static void append_str(char **str, const char *data)
     *str += strlen(*str);
 }
 
-static void create_inf_file()
+static void create_inf_file(void)
 {
     char data[1024];
     char *ptr = data;
@@ -215,7 +215,7 @@ static void create_inf_file()
     CloseHandle(hf);
 }
 
-static void translateinfstring_test()
+static void translateinfstring_test(void)
 {
     HRESULT hr;
     char buffer[MAX_PATH];
diff --git a/dlls/advpack/tests/install.c b/dlls/advpack/tests/install.c
index bc987ddfbbb..deac91ab0c5 100644
--- a/dlls/advpack/tests/install.c
+++ b/dlls/advpack/tests/install.c
@@ -30,7 +30,7 @@ static HRESULT (WINAPI *pLaunchINFSectionEx)(HWND, HINSTANCE, LPSTR, INT);
 
 static char CURR_DIR[MAX_PATH];
 
-static BOOL init_function_pointers()
+static BOOL init_function_pointers(void)
 {
     HMODULE hAdvPack = LoadLibraryA("advpack.dll");
     if (!hAdvPack)
@@ -80,7 +80,7 @@ static void create_inf_file(LPCSTR filename)
     CloseHandle(hf);
 }
 
-static void test_RunSetupCommand()
+static void test_RunSetupCommand(void)
 {
     HRESULT hr;
     HANDLE hexe;
@@ -194,7 +194,7 @@ static void test_RunSetupCommand()
        "Expected HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND), got %d\n", hr);
 }
 
-static void test_LaunchINFSection()
+static void test_LaunchINFSection(void)
 {
     HRESULT hr;
     char cmdline[MAX_PATH];
@@ -226,7 +226,7 @@ static void test_LaunchINFSection()
     DeleteFileA("test.inf");
 }
 
-static void test_LaunchINFSectionEx()
+static void test_LaunchINFSectionEx(void)
 {
     HRESULT hr;
     char cmdline[MAX_PATH];
diff --git a/dlls/browseui/tests/autocomplete.c b/dlls/browseui/tests/autocomplete.c
index 72d8f9691be..b0dc5395d3a 100644
--- a/dlls/browseui/tests/autocomplete.c
+++ b/dlls/browseui/tests/autocomplete.c
@@ -222,7 +222,7 @@ IACListVtbl TestACL_ACListVtbl =
 #define expect_end(obj) \
     ok(obj->lpVtbl->Next(obj, 1, &wstr, &i) == S_FALSE, "Unexpected return from Next\n");
 
-void test_ACLMulti()
+void test_ACLMulti(void)
 {
     const char *strings1[] = {"a", "c", "e"};
     const char *strings2[] = {"a", "b", "d"};
diff --git a/dlls/comctl32/tests/listview.c b/dlls/comctl32/tests/listview.c
index 046823770ce..bbde3777900 100644
--- a/dlls/comctl32/tests/listview.c
+++ b/dlls/comctl32/tests/listview.c
@@ -139,7 +139,7 @@ static LRESULT WINAPI listview_subclass_proc(HWND hwnd, UINT message, WPARAM wPa
     return ret;
 }
 
-static HWND create_listview_control()
+static HWND create_listview_control(void)
 {
     struct subclass_info *info;
     HWND hwnd;
@@ -567,7 +567,7 @@ static LRESULT CALLBACK create_test_wndproc(HWND hwnd, UINT uMsg, WPARAM wParam,
     return CallWindowProc(listviewWndProc, hwnd, uMsg, wParam, lParam);
 }
 
-static void test_create()
+static void test_create(void)
 {
     HWND hList;
     HWND hHeader;
diff --git a/dlls/comctl32/tests/rebar.c b/dlls/comctl32/tests/rebar.c
index e7694200638..d715d33b4a2 100644
--- a/dlls/comctl32/tests/rebar.c
+++ b/dlls/comctl32/tests/rebar.c
@@ -308,7 +308,7 @@ static void add_band_w(HWND hRebar, LPCSTR lpszText, int cxMinChild, int cx, int
     SendMessage(hRebar, RB_INSERTBAND, -1, (LPARAM)&rbi);
 }
 
-static void layout_test()
+static void layout_test(void)
 {
     HWND hRebar = NULL;
     REBARBANDINFO rbi;
@@ -625,7 +625,7 @@ static int resize_numtests = 0;
 
 #endif
 
-static void resize_test()
+static void resize_test(void)
 {
     DWORD dwStyles[] = {CCS_TOP, CCS_TOP | CCS_NODIVIDER, CCS_BOTTOM, CCS_BOTTOM | CCS_NODIVIDER, CCS_VERT, CCS_RIGHT,
         CCS_NOPARENTALIGN, CCS_NOPARENTALIGN | CCS_NODIVIDER, CCS_NORESIZE, CCS_NOMOVEY, CCS_NOMOVEY | CCS_VERT,
@@ -713,7 +713,7 @@ static void expect_band_content(UINT uBand, UINT fStyle, COLORREF clrFore,
     expect_eq(rb.cxHeader, cxHeader, int, "%d");
 }
 
-static void bandinfo_test()
+static void bandinfo_test(void)
 {
     REBARBANDINFOA rb;
     CHAR szABC[] = "ABC";
diff --git a/dlls/comctl32/tests/updown.c b/dlls/comctl32/tests/updown.c
index 87345a14eb7..5546ab5b9d0 100644
--- a/dlls/comctl32/tests/updown.c
+++ b/dlls/comctl32/tests/updown.c
@@ -198,7 +198,7 @@ static LRESULT WINAPI edit_subclass_proc(HWND hwnd, UINT message, WPARAM wParam,
     return ret;
 }
 
-static HWND create_edit_control()
+static HWND create_edit_control(void)
 {
     struct subclass_info *info;
     RECT rect;
@@ -247,7 +247,7 @@ static LRESULT WINAPI updown_subclass_proc(HWND hwnd, UINT message, WPARAM wPara
     return ret;
 }
 
-static HWND create_updown_control()
+static HWND create_updown_control(void)
 {
     struct subclass_info *info;
     HWND updown;
diff --git a/dlls/ddraw/tests/visual.c b/dlls/ddraw/tests/visual.c
index e2eef0c21e3..f79586cd187 100644
--- a/dlls/ddraw/tests/visual.c
+++ b/dlls/ddraw/tests/visual.c
@@ -31,7 +31,7 @@ IDirect3DDevice7    *Direct3DDevice = NULL;
 
 static HRESULT (WINAPI *pDirectDrawCreateEx)(LPGUID,LPVOID*,REFIID,LPUNKNOWN);
 
-static BOOL createObjects()
+static BOOL createObjects(void)
 {
     HRESULT hr;
     HMODULE hmod = GetModuleHandleA("ddraw.dll");
@@ -104,7 +104,7 @@ static BOOL createObjects()
     return FALSE;
 }
 
-static void releaseObjects()
+static void releaseObjects(void)
 {
     IDirect3DDevice7_Release(Direct3DDevice);
     IDirect3D7_Release(Direct3D);
diff --git a/dlls/devenum/createdevenum.c b/dlls/devenum/createdevenum.c
index b9c1605846d..824a3df73e1 100644
--- a/dlls/devenum/createdevenum.c
+++ b/dlls/devenum/createdevenum.c
@@ -221,7 +221,7 @@ static HRESULT DEVENUM_CreateAMCategoryKey(const CLSID * clsidCategory)
  *
  * Creates the keys in the registry for the dynamic categories
  */
-static HRESULT DEVENUM_CreateSpecialCategories()
+static HRESULT DEVENUM_CreateSpecialCategories(void)
 {
     HRESULT res;
     WCHAR szDSoundNameFormat[MAX_PATH + 1];
diff --git a/dlls/devenum/devenum_main.c b/dlls/devenum/devenum_main.c
index 0dde409da3a..0ab12e59d75 100644
--- a/dlls/devenum/devenum_main.c
+++ b/dlls/devenum/devenum_main.c
@@ -365,7 +365,7 @@ static HRESULT register_clsids(int count, const register_info * pRegInfo, LPCWST
 typedef HRESULT (WINAPI *DllRegisterServer_func)(void);
 
 /* calls DllRegisterServer() for the Quartz DLL */
-static void DEVENUM_RegisterQuartz()
+static void DEVENUM_RegisterQuartz(void)
 {
     HANDLE hDLL = LoadLibraryA("quartz.dll");
     DllRegisterServer_func pDllRegisterServer = NULL;
diff --git a/dlls/devenum/mediacatenum.c b/dlls/devenum/mediacatenum.c
index 93e9328ccf5..df109362e38 100644
--- a/dlls/devenum/mediacatenum.c
+++ b/dlls/devenum/mediacatenum.c
@@ -679,7 +679,7 @@ static const IMonikerVtbl IMoniker_Vtbl =
     DEVENUM_IMediaCatMoniker_IsSystemMoniker
 };
 
-MediaCatMoniker * DEVENUM_IMediaCatMoniker_Construct()
+MediaCatMoniker * DEVENUM_IMediaCatMoniker_Construct(void)
 {
     MediaCatMoniker * pMoniker = NULL;
     pMoniker = CoTaskMemAlloc(sizeof(MediaCatMoniker));
diff --git a/dlls/dsound/tests/ds3d.c b/dlls/dsound/tests/ds3d.c
index d3619d30e3d..779001487b8 100644
--- a/dlls/dsound/tests/ds3d.c
+++ b/dlls/dsound/tests/ds3d.c
@@ -112,7 +112,7 @@ const char * getDSBCAPS(DWORD xmask) {
     return buffer;
 }
 
-HWND get_hwnd()
+HWND get_hwnd(void)
 {
     HWND hwnd=GetForegroundWindow();
     if (!hwnd)
diff --git a/dlls/gdi32/opengl.c b/dlls/gdi32/opengl.c
index 67939186c69..f450f659752 100644
--- a/dlls/gdi32/opengl.c
+++ b/dlls/gdi32/opengl.c
@@ -51,7 +51,7 @@ typedef struct opengl_context
  * Some functions don't receive a hDC. This function creates a global hdc and
  * if there's already a global hdc, it returns it.
  */
-static DC* OPENGL_GetDefaultDC()
+static DC* OPENGL_GetDefaultDC(void)
 {
     if(!default_hdc)
         default_hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
diff --git a/dlls/gdi32/tests/font.c b/dlls/gdi32/tests/font.c
index 43e9c3afd16..c695e13d3d5 100644
--- a/dlls/gdi32/tests/font.c
+++ b/dlls/gdi32/tests/font.c
@@ -518,7 +518,7 @@ static void test_text_extents(void)
     ReleaseDC(NULL, hdc);
 }
 
-static void test_GetGlyphIndices()
+static void test_GetGlyphIndices(void)
 {
     HDC      hdc;
     HFONT    hfont;
diff --git a/dlls/kernel32/tests/change.c b/dlls/kernel32/tests/change.c
index 54bdffa604e..9b6c52be3e0 100644
--- a/dlls/kernel32/tests/change.c
+++ b/dlls/kernel32/tests/change.c
@@ -319,7 +319,7 @@ static void test_ffcn(void)
 
 /* this test concentrates on the wait behavior when multiple threads are
  * waiting on a change notification handle. */
-static void test_ffcnMultipleThreads()
+static void test_ffcnMultipleThreads(void)
 {
     LONG r;
     DWORD filter, threadId, status, exitcode;
diff --git a/dlls/mscoree/mscoree_main.c b/dlls/mscoree/mscoree_main.c
index d44e621566e..fd2c0a9d0e0 100644
--- a/dlls/mscoree/mscoree_main.c
+++ b/dlls/mscoree/mscoree_main.c
@@ -75,7 +75,7 @@ BOOL WINAPI _CorDllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     return TRUE;
 }
 
-static LPWSTR get_mono_exe()
+static LPWSTR get_mono_exe(void)
 {
     static const WCHAR mono_exe[] = {'b','i','n','\\','m','o','n','o','.','e','x','e',' ',0};
     static const WCHAR mono_key[] = {'S','o','f','t','w','a','r','e','\\','N','o','v','e','l','l','\\','M','o','n','o',0};
diff --git a/dlls/mshtml/nsembed.c b/dlls/mshtml/nsembed.c
index 2cf4d88e658..17d22a09cd3 100644
--- a/dlls/mshtml/nsembed.c
+++ b/dlls/mshtml/nsembed.c
@@ -624,7 +624,7 @@ void nsnode_to_nsstring(nsIDOMNode *nsdoc, nsAString *str)
     nsIContentSerializer_Release(serializer);
 }
 
-void close_gecko()
+void close_gecko(void)
 {
     TRACE("()\n");
 
diff --git a/dlls/oleaut32/tests/olefont.c b/dlls/oleaut32/tests/olefont.c
index c9ea99f751b..69621cf965a 100644
--- a/dlls/oleaut32/tests/olefont.c
+++ b/dlls/oleaut32/tests/olefont.c
@@ -483,7 +483,7 @@ static void test_Invoke(void)
     IFontDisp_Release(fontdisp);
 }
 
-static void test_IsEqual()
+static void test_IsEqual(void)
 {
     FONTDESC fd;
     LPVOID pvObj = NULL;
diff --git a/dlls/secur32/tests/ntlm.c b/dlls/secur32/tests/ntlm.c
index 4191bb08e9a..9163f88d5cc 100644
--- a/dlls/secur32/tests/ntlm.c
+++ b/dlls/secur32/tests/ntlm.c
@@ -552,7 +552,7 @@ static void communicate(SspiData *from, SspiData *to)
 }
 
 /**********************************************************************/
-static void testInitializeSecurityContextFlags()
+static void testInitializeSecurityContextFlags(void)
 {
     SECURITY_STATUS         sec_status;
     PSecPkgInfo             pkg_info = NULL;
@@ -897,7 +897,7 @@ tAuthend:
             getSecError(sec_status));
 }
 
-static void testSignSeal()
+static void testSignSeal(void)
 {
     SECURITY_STATUS         client_stat = SEC_I_CONTINUE_NEEDED;
     SECURITY_STATUS         server_stat = SEC_I_CONTINUE_NEEDED;
diff --git a/dlls/shell32/pidl.c b/dlls/shell32/pidl.c
index af77eec56da..c5a79e053a9 100644
--- a/dlls/shell32/pidl.c
+++ b/dlls/shell32/pidl.c
@@ -1357,7 +1357,7 @@ LPITEMIDLIST _ILAlloc(PIDLTYPE type, unsigned int size)
     return pidlOut;
 }
 
-LPITEMIDLIST _ILCreateDesktop()
+LPITEMIDLIST _ILCreateDesktop(void)
 {
     LPITEMIDLIST ret;
 
@@ -1368,25 +1368,25 @@ LPITEMIDLIST _ILCreateDesktop()
     return ret;
 }
 
-LPITEMIDLIST _ILCreateMyComputer()
+LPITEMIDLIST _ILCreateMyComputer(void)
 {
     TRACE("()\n");
     return _ILCreateGuid(PT_GUID, &CLSID_MyComputer);
 }
 
-LPITEMIDLIST _ILCreateMyDocuments()
+LPITEMIDLIST _ILCreateMyDocuments(void)
 {
     TRACE("()\n");
     return _ILCreateGuid(PT_GUID, &CLSID_MyDocuments);
 }
 
-LPITEMIDLIST _ILCreateIExplore()
+LPITEMIDLIST _ILCreateIExplore(void)
 {
     TRACE("()\n");
     return _ILCreateGuid(PT_GUID, &CLSID_Internet);
 }
 
-LPITEMIDLIST _ILCreateControlPanel()
+LPITEMIDLIST _ILCreateControlPanel(void)
 {
     LPITEMIDLIST parent = _ILCreateGuid(PT_GUID, &CLSID_MyComputer), ret = NULL;
 
@@ -1405,7 +1405,7 @@ LPITEMIDLIST _ILCreateControlPanel()
     return ret;
 }
 
-LPITEMIDLIST _ILCreatePrinters()
+LPITEMIDLIST _ILCreatePrinters(void)
 {
     LPITEMIDLIST parent = _ILCreateGuid(PT_GUID, &CLSID_MyComputer), ret = NULL;
 
@@ -1424,13 +1424,13 @@ LPITEMIDLIST _ILCreatePrinters()
     return ret;
 }
 
-LPITEMIDLIST _ILCreateNetwork()
+LPITEMIDLIST _ILCreateNetwork(void)
 {
     TRACE("()\n");
     return _ILCreateGuid(PT_GUID, &CLSID_NetworkPlaces);
 }
 
-LPITEMIDLIST _ILCreateBitBucket()
+LPITEMIDLIST _ILCreateBitBucket(void)
 {
     TRACE("()\n");
     return _ILCreateGuid(PT_GUID, &CLSID_RecycleBin);
diff --git a/dlls/shlwapi/tests/string.c b/dlls/shlwapi/tests/string.c
index 6f7b5111b98..7f14e69fae1 100644
--- a/dlls/shlwapi/tests/string.c
+++ b/dlls/shlwapi/tests/string.c
@@ -691,7 +691,7 @@ static void test_StrCpyNXW(void)
     ok(ret##type == (exp), "Type " #type ", expected %p but got %p (string base %p)\n", \
     (exp), ret##type, str);
 
-static void test_StrRStrI()
+static void test_StrRStrI(void)
 {
     static const CHAR szTest[] = "yAxxxxAy";
     static const CHAR szTest2[] = "ABABABAB";
@@ -760,7 +760,7 @@ static void test_SHUnicodeToUnicode(void)
      dwRet, dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]);
 }
 
-static void test_StrXXX_overflows()
+static void test_StrXXX_overflows(void)
 {
     CHAR str1[2*MAX_PATH+1], buf[2*MAX_PATH];
     WCHAR wstr1[2*MAX_PATH+1], wbuf[2*MAX_PATH];
diff --git a/dlls/wineps.drv/glyphlist.c b/dlls/wineps.drv/glyphlist.c
index c16694760b4..eeb17166ad0 100644
--- a/dlls/wineps.drv/glyphlist.c
+++ b/dlls/wineps.drv/glyphlist.c
@@ -42,7 +42,7 @@ static BOOL 	    glyphNamesIndexed = TRUE;
  *  the AGL glyph names into it; returns 0 on success, 1 on failure
  *
  */
-INT PSDRV_GlyphListInit()
+INT PSDRV_GlyphListInit(void)
 {
     INT i;
 
@@ -180,7 +180,7 @@ const GLYPHNAME *PSDRV_GlyphName(LPCSTR szName)
  *  Initializes index member of all GLYPHNAME structures
  *
  */
-VOID PSDRV_IndexGlyphList()
+VOID PSDRV_IndexGlyphList(void)
 {
     INT i;
 
diff --git a/dlls/winex11.drv/clipboard.c b/dlls/winex11.drv/clipboard.c
index cf3aa9a4035..57c52f6afae 100644
--- a/dlls/winex11.drv/clipboard.c
+++ b/dlls/winex11.drv/clipboard.c
@@ -1025,7 +1025,7 @@ static BOOL X11DRV_CLIPBOARD_RenderSynthesizedText(UINT wFormatID)
  *
  * Renders synthesized DIB
  */
-static BOOL X11DRV_CLIPBOARD_RenderSynthesizedDIB()
+static BOOL X11DRV_CLIPBOARD_RenderSynthesizedDIB(void)
 {
     BOOL bret = FALSE;
     LPWINE_CLIPDATA lpSource = NULL;
@@ -1067,7 +1067,7 @@ static BOOL X11DRV_CLIPBOARD_RenderSynthesizedDIB()
  *
  * Renders synthesized bitmap
  */
-static BOOL X11DRV_CLIPBOARD_RenderSynthesizedBitmap()
+static BOOL X11DRV_CLIPBOARD_RenderSynthesizedBitmap(void)
 {
     BOOL bret = FALSE;
     LPWINE_CLIPDATA lpSource = NULL;
diff --git a/dlls/wnaspi32/aspi.c b/dlls/wnaspi32/aspi.c
index e0a011c9ef7..c4bc1bbd396 100644
--- a/dlls/wnaspi32/aspi.c
+++ b/dlls/wnaspi32/aspi.c
@@ -116,7 +116,7 @@ static void set_last_error(void)
 static const WCHAR wDevicemapScsi[] = {'H','A','R','D','W','A','R','E','\\','D','E','V','I','C','E','M','A','P','\\','S','c','s','i',0};
 
 /* Exported functions */
-int ASPI_GetNumControllers()
+int ASPI_GetNumControllers(void)
 {
     HKEY hkeyScsi, hkeyPort;
     DWORD i = 0, numPorts, num_ha = 0;
diff --git a/include/msiquery.h b/include/msiquery.h
index 231f9becefe..5ea654ca7d3 100644
--- a/include/msiquery.h
+++ b/include/msiquery.h
@@ -298,6 +298,6 @@ LANGID WINAPI MsiGetLanguage(MSIHANDLE);
 
 UINT WINAPI MsiSetInstallLevel(MSIHANDLE, int);
 
-MSIHANDLE WINAPI MsiGetLastErrorRecord();
+MSIHANDLE WINAPI MsiGetLastErrorRecord(void);
 
 #endif /* __WINE_MSIQUERY_H */
diff --git a/programs/progman/group.c b/programs/progman/group.c
index 031d014bdce..c8e79edfd17 100644
--- a/programs/progman/group.c
+++ b/programs/progman/group.c
@@ -57,7 +57,7 @@ static LRESULT CALLBACK GROUP_GroupWndProc(HWND hWnd, UINT msg,
  *           GROUP_RegisterGroupWinClass
  */
 
-ATOM GROUP_RegisterGroupWinClass()
+ATOM GROUP_RegisterGroupWinClass(void)
 {
   WNDCLASS class;
 
@@ -80,7 +80,7 @@ ATOM GROUP_RegisterGroupWinClass()
  *           GROUP_NewGroup
  */
 
-VOID GROUP_NewGroup()
+VOID GROUP_NewGroup(void)
 {
   CHAR szName[MAX_PATHNAME_LEN] = "";
   CHAR szFile[MAX_PATHNAME_LEN] = "";
@@ -271,7 +271,7 @@ VOID GROUP_DeleteGroup(HLOCAL hGroup)
  *           GROUP_FirstGroup
  */
 
-HLOCAL GROUP_FirstGroup()
+HLOCAL GROUP_FirstGroup(void)
 {
   return(Globals.hGroups);
 }
@@ -294,7 +294,7 @@ HLOCAL GROUP_NextGroup(HLOCAL hGroup)
  *           GROUP_ActiveGroup
  */
 
-HLOCAL GROUP_ActiveGroup()
+HLOCAL GROUP_ActiveGroup(void)
 {
   return(Globals.hActiveGroup);
 }
diff --git a/programs/progman/main.c b/programs/progman/main.c
index 932cf4390c3..83a346c5f59 100644
--- a/programs/progman/main.c
+++ b/programs/progman/main.c
@@ -110,7 +110,7 @@ int PASCAL WinMain (HINSTANCE hInstance, HINSTANCE prev, LPSTR cmdline, int show
  *           MAIN_CreateGroups
  */
 
-static VOID MAIN_CreateGroups()
+static VOID MAIN_CreateGroups(void)
 {
   CHAR buffer[BUFFER_SIZE];
   CHAR szPath[MAX_PATHNAME_LEN];
@@ -144,7 +144,7 @@ static VOID MAIN_CreateGroups()
  *           MAIN_AutoStart
  */
 
-VOID MAIN_AutoStart()
+VOID MAIN_AutoStart(void)
 {
   CHAR buffer[BUFFER_SIZE];
   HLOCAL hGroup, hProgram;
@@ -344,7 +344,7 @@ static VOID MAIN_MenuCommand(HWND hWnd, WPARAM wParam, LPARAM lParam)
  *           MAIN_RegisterMainWinClass
  */
 
-static ATOM MAIN_RegisterMainWinClass()
+static ATOM MAIN_RegisterMainWinClass(void)
 {
   WNDCLASS class;
 
@@ -367,7 +367,7 @@ static ATOM MAIN_RegisterMainWinClass()
  *           MAIN_CreateMainWindow
  */
 
-static VOID MAIN_CreateMainWindow()
+static VOID MAIN_CreateMainWindow(void)
 {
   INT  left , top, right, bottom, width, height, show;
   CHAR buffer[100];
@@ -404,7 +404,7 @@ static VOID MAIN_CreateMainWindow()
  *           MAIN_CreateMDIWindow
  */
 
-static VOID MAIN_CreateMDIWindow()
+static VOID MAIN_CreateMDIWindow(void)
 {
   CLIENTCREATESTRUCT ccs;
   RECT rect;
diff --git a/programs/progman/program.c b/programs/progman/program.c
index 347378ce041..bfbbc89e7b1 100644
--- a/programs/progman/program.c
+++ b/programs/progman/program.c
@@ -71,7 +71,7 @@ static LRESULT CALLBACK PROGRAM_ProgramWndProc(HWND hWnd, UINT msg, WPARAM wPara
  *           PROGRAM_RegisterProgramWinClass
  */
 
-ATOM PROGRAM_RegisterProgramWinClass()
+ATOM PROGRAM_RegisterProgramWinClass(void)
 {
   WNDCLASS class;
 
diff --git a/programs/regedit/hexedit.c b/programs/regedit/hexedit.c
index 3fb927b1543..fcf2a58de5b 100644
--- a/programs/regedit/hexedit.c
+++ b/programs/regedit/hexedit.c
@@ -673,7 +673,7 @@ HexEdit_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
     return 0;
 }
 
-void HexEdit_Register()
+void HexEdit_Register(void)
 {
     WNDCLASS wndClass;
 
@@ -690,7 +690,7 @@ void HexEdit_Register()
 }
 
 
-void HexEdit_Unregister()
+void HexEdit_Unregister(void)
 {
     UnregisterClass(HEXEDIT_CLASS, NULL);
 }
diff --git a/programs/winecfg/drive.c b/programs/winecfg/drive.c
index 9e81ab24e2e..69b56995a87 100644
--- a/programs/winecfg/drive.c
+++ b/programs/winecfg/drive.c
@@ -260,7 +260,7 @@ BOOL moveDrive(struct drive *pSrc, struct drive *pDst)
 #endif
 
 /* Load currently defined drives into the drives array  */
-void load_drives()
+void load_drives(void)
 {
     char *devices, *dev;
     int len;
diff --git a/programs/winecfg/drivedetect.c b/programs/winecfg/drivedetect.c
index 99270439013..0b07bdf8677 100644
--- a/programs/winecfg/drivedetect.c
+++ b/programs/winecfg/drivedetect.c
@@ -289,7 +289,7 @@ static void ensure_drive_c_is_mapped(void)
     }
 }
 
-int autodetect_drives()
+int autodetect_drives(void)
 {
 #ifdef HAVE_MNTENT_H
     struct mntent *ent;
diff --git a/programs/winecfg/theme.c b/programs/winecfg/theme.c
index f34d1cafe6a..4f3a3773d9b 100644
--- a/programs/winecfg/theme.c
+++ b/programs/winecfg/theme.c
@@ -629,7 +629,7 @@ static void init_shell_folder_listview_headers(HWND dialog) {
 }
 
 /* Reads the currently set shell folder symbol link targets into asfiInfo. */
-static void read_shell_folder_link_targets() {
+static void read_shell_folder_link_targets(void) {
     WCHAR wszPath[MAX_PATH];
     HRESULT hr;
     int i;
@@ -763,7 +763,7 @@ static void on_shell_folder_edit_changed(HWND hDlg) {
     SendMessage(GetParent(hDlg), PSM_CHANGED, 0, 0);
 }
 
-static void apply_shell_folder_changes() {
+static void apply_shell_folder_changes(void) {
     WCHAR wszPath[MAX_PATH];
     char szBackupPath[FILENAME_MAX], szUnixPath[FILENAME_MAX], *pszUnixPath = NULL;
     int i, cUnixPathLen;
diff --git a/programs/wineconsole/wineconsole.c b/programs/wineconsole/wineconsole.c
index 91cc5813021..b9654654c7b 100644
--- a/programs/wineconsole/wineconsole.c
+++ b/programs/wineconsole/wineconsole.c
@@ -51,7 +51,7 @@ static void printf_res(UINT uResId, ...)
     va_end(args);
 }
 
-static void WINECON_Usage()
+static void WINECON_Usage(void)
 {
     printf_res(IDS_USAGE_HEADER);
     printf_res(IDS_USAGE_BACKEND);
diff --git a/programs/wordpad/wordpad.c b/programs/wordpad/wordpad.c
index bd0aeaed88e..c4f52d83df0 100644
--- a/programs/wordpad/wordpad.c
+++ b/programs/wordpad/wordpad.c
@@ -49,7 +49,7 @@ static HWND hEditorWnd;
 static char szFilter[MAX_STRING_LEN];
 
 /* Load string resources */
-static void DoLoadStrings()
+static void DoLoadStrings(void)
 {
     LPSTR p = szFilter;
     char files_rtf[] = "*.rtf";
@@ -176,7 +176,7 @@ static void DoOpenFile(LPCWSTR szFileName)
     SetWindowText(hMainWnd, szCaption);
 }
 
-static void DialogOpenFile()
+static void DialogOpenFile(void)
 {
     OPENFILENAME ofn;
 
@@ -253,7 +253,7 @@ static void HandleCommandLine(LPWSTR cmdline)
         MessageBox(hMainWnd, "Printing not implemented", "WordPad", MB_OK);
 }
 
-static void DoDefaultFont()
+static void DoDefaultFont(void)
 {
     static const WCHAR szFaceName[] = {'T','i','m','e','s',' ','N','e','w',' ','R','o','m','a','n',0};
     CHARFORMAT2W fmt;