diff --git a/include/color.h b/include/color.h
index d226a199206..949c180885a 100644
--- a/include/color.h
+++ b/include/color.h
@@ -20,9 +20,9 @@ extern COLORREF	  COLOR_ToLogical(int pixel);
 extern int 	  COLOR_ToPhysical( DC *dc, COLORREF color );
 extern int 	  COLOR_SetMapping( PALETTEOBJ* pal, UINT32 uStart, UINT32 uNum, BOOL32 mapOnly );
 extern BOOL32 	  COLOR_IsSolid( COLORREF color );
-extern Colormap	  COLOR_GetColormap();
-extern UINT16	  COLOR_GetSystemPaletteSize();
-extern UINT16	  COLOR_GetSystemPaletteFlags();
+extern Colormap	  COLOR_GetColormap(void);
+extern UINT16	  COLOR_GetSystemPaletteSize(void);
+extern UINT16	  COLOR_GetSystemPaletteFlags(void);
 extern const PALETTEENTRY* COLOR_GetSystemPaletteTemplate(void);
 extern BOOL32	  COLOR_GetMonoPlane( int* );
 
diff --git a/include/imagehlp.h b/include/imagehlp.h
index 95fce3ebcc9..34949b2ed49 100644
--- a/include/imagehlp.h
+++ b/include/imagehlp.h
@@ -669,6 +669,7 @@ BOOL32 WINAPI ImageUnload32(
   PLOADED_IMAGE32 LoadedImage
 );
 PAPI_VERSION32 WINAPI ImagehlpApiVersion32(
+  void 
 );
 PAPI_VERSION32 WINAPI ImagehlpApiVersionEx32(
   PAPI_VERSION32 AppVersion
@@ -743,6 +744,7 @@ BOOL32 WINAPI SymGetModuleInfo32(
   PIMAGEHLP_MODULE32 ModuleInfo
 );
 DWORD WINAPI SymGetOptions32(
+  void
 );
 BOOL32 WINAPI SymGetSearchPath32(
   HANDLE32 hProcess, LPSTR szSearchPath, DWORD SearchPathLength
diff --git a/include/palette.h b/include/palette.h
index c913fd13bbe..c90842a54d3 100644
--- a/include/palette.h
+++ b/include/palette.h
@@ -19,7 +19,7 @@ typedef struct
     LOGPALETTE  logpalette; /* _MUST_ be the last field */
 } PALETTEOBJ;
 
-extern HPALETTE16 PALETTE_Init();
+extern HPALETTE16 PALETTE_Init(void);
 extern int PALETTE_GetObject( PALETTEOBJ * palette, int count, LPSTR buffer );
 extern BOOL32 PALETTE_DeleteObject( HPALETTE16 hpalette, PALETTEOBJ *palette );
 extern BOOL32 PALETTE_UnrealizeObject( HPALETTE16 hpalette, PALETTEOBJ *palette);
diff --git a/memory/global.c b/memory/global.c
index 80411ce6332..69934e36930 100644
--- a/memory/global.c
+++ b/memory/global.c
@@ -75,7 +75,7 @@ static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
 }
 
 
-void debug_handles()
+void debug_handles(void)
 {
     int printed=0;
     int i;
diff --git a/misc/registry.c b/misc/registry.c
index 800727eec8a..a9305e34156 100644
--- a/misc/registry.c
+++ b/misc/registry.c
@@ -40,7 +40,7 @@
 #include "winreg.h"
 #include "winversion.h"
 
-static void REGISTRY_Init();
+static void REGISTRY_Init(void);
 /* FIXME: following defines should be configured global ... */
 
 /* NOTE: do not append a /. linux' mkdir() WILL FAIL if you do that */
@@ -404,7 +404,7 @@ static void split_keypath( LPCWSTR wp, LPWSTR **wpv, int *wpc)
  * REGISTRY_Init [Internal]
  * Registry initialisation, allocates some default keys. 
  */
-static void REGISTRY_Init() {
+static void REGISTRY_Init(void) {
 	HKEY	hkey;
 	char	buf[200];
 
@@ -1560,7 +1560,7 @@ __w31_dumptree(	unsigned short idx,
 /******************************************************************************
  * _w31_loadreg [Internal]
  */
-void _w31_loadreg() {
+void _w31_loadreg(void) {
 	HFILE32			hf;
 	struct _w31_header	head;
 	struct _w31_tabent	*tab;
diff --git a/windows/defwnd.c b/windows/defwnd.c
index cfc8683ce04..fc431ae0532 100644
--- a/windows/defwnd.c
+++ b/windows/defwnd.c
@@ -374,7 +374,7 @@ static LRESULT DEFWND_DefWinProc( WND *wndPtr, UINT32 msg, WPARAM32 wParam,
             for(len=1; len<64; len++)
                 if((hIcon=LoadIcon16(wndPtr->hInstance,MAKEINTRESOURCE16(len))))
                     return (LRESULT)hIcon;
-            return (LRESULT)LoadIcon16(NULL,IDI_APPLICATION16);
+            return (LRESULT)LoadIcon16(0,IDI_APPLICATION16);
         }
         break;