diff --git a/reactos/win32ss/gdi/ntgdi/device.c b/reactos/win32ss/gdi/ntgdi/device.c
index 58362251e3b..94ac8ede26b 100644
--- a/reactos/win32ss/gdi/ntgdi/device.c
+++ b/reactos/win32ss/gdi/ntgdi/device.c
@@ -26,7 +26,7 @@ IntGdiUnreferencePdev(PPDEVOBJ ppdev, DWORD CleanUpType)
 }
 
 BOOL FASTCALL
-IntCreatePrimarySurface()
+IntCreatePrimarySurface(VOID)
 {
     SIZEL SurfSize;
     SURFOBJ *pso;
@@ -66,7 +66,7 @@ IntCreatePrimarySurface()
 }
 
 VOID FASTCALL
-IntDestroyPrimarySurface()
+IntDestroyPrimarySurface(VOID)
 {
     UNIMPLEMENTED;
 }
diff --git a/reactos/win32ss/user/ntuser/clipboard.c b/reactos/win32ss/user/ntuser/clipboard.c
index 60c355bcc73..821b9c4079f 100644
--- a/reactos/win32ss/user/ntuser/clipboard.c
+++ b/reactos/win32ss/user/ntuser/clipboard.c
@@ -18,7 +18,7 @@ DBG_DEFAULT_CHANNEL(UserClipbrd);
 #define IS_DATA_SYNTHESIZED(ce) ((ce)->hData == DATA_SYNTH_USER || (ce)->hData == DATA_SYNTH_KRNL)
 
 PWINSTATION_OBJECT static FASTCALL
-IntGetWinStaForCbAccess()
+IntGetWinStaForCbAccess(VOID)
 {
     HWINSTA hWinSta;
     PWINSTATION_OBJECT pWinStaObj;
diff --git a/reactos/win32ss/user/ntuser/hook.c b/reactos/win32ss/user/ntuser/hook.c
index f3e180e9bf7..ca1201c698a 100644
--- a/reactos/win32ss/user/ntuser/hook.c
+++ b/reactos/win32ss/user/ntuser/hook.c
@@ -131,7 +131,7 @@ IntHookModuleUnloaded(PDESKTOP pdesk, int iHookID, HHOOK hHook)
 
 BOOL
 FASTCALL
-UserLoadApiHook()
+UserLoadApiHook(VOID)
 {
     return IntLoadHookModule(WH_APIHOOK, 0, FALSE);
 }
@@ -206,7 +206,7 @@ UserRegisterUserApiHook(
 
 BOOL
 FASTCALL
-UserUnregisterUserApiHook()
+UserUnregisterUserApiHook(VOID)
 {
     PTHREADINFO pti;
 
diff --git a/reactos/win32ss/user/ntuser/hook.h b/reactos/win32ss/user/ntuser/hook.h
index 7d44cee2ed0..146bd087897 100644
--- a/reactos/win32ss/user/ntuser/hook.h
+++ b/reactos/win32ss/user/ntuser/hook.h
@@ -50,9 +50,9 @@ PHOOK FASTCALL IntGetNextHook(PHOOK Hook);
 LRESULT FASTCALL UserCallNextHookEx( PHOOK pHook, int Code, WPARAM wParam, LPARAM lParam, BOOL Ansi);
 BOOL FASTCALL IntUnhookWindowsHook(int,HOOKPROC);
 
-BOOL FASTCALL UserLoadApiHook();
+BOOL FASTCALL UserLoadApiHook(VOID);
 BOOL IntLoadHookModule(int iHookID, HHOOK hHook, BOOL Unload);
-BOOL FASTCALL UserUnregisterUserApiHook();
+BOOL FASTCALL UserUnregisterUserApiHook(VOID);
 
 extern PPROCESSINFO ppiUahServer;
 
diff --git a/reactos/win32ss/user/win32csr/guiconsole.c b/reactos/win32ss/user/win32csr/guiconsole.c
index 85f083fcd1a..6a2c4c29114 100644
--- a/reactos/win32ss/user/win32csr/guiconsole.c
+++ b/reactos/win32ss/user/win32csr/guiconsole.c
@@ -1712,7 +1712,7 @@ GuiConsoleResize(HWND hWnd, WPARAM wParam, LPARAM lParam)
 
 VOID
 FASTCALL
-GuiConsoleHandleScrollbarMenu()
+GuiConsoleHandleScrollbarMenu(VOID)
 {
     HMENU hMenu;
 
diff --git a/reactos/win32ss/user/win32csr/guiconsole.h b/reactos/win32ss/user/win32csr/guiconsole.h
index 705fbba0d92..b9560d19ba2 100644
--- a/reactos/win32ss/user/win32csr/guiconsole.h
+++ b/reactos/win32ss/user/win32csr/guiconsole.h
@@ -14,5 +14,6 @@
 #define CONGUI_UPDATE_TIMER   1
 
 NTSTATUS FASTCALL GuiInitConsole(PCSRSS_CONSOLE Console, BOOL Visible);
+VOID FASTCALL GuiConsoleHandleScrollbarMenu(VOID);
 
 /*EOF*/