diff --git a/sdk/include/reactos/undocuser.h b/sdk/include/reactos/undocuser.h
index dbe93b2ac9b..f130e6b1a99 100644
--- a/sdk/include/reactos/undocuser.h
+++ b/sdk/include/reactos/undocuser.h
@@ -229,7 +229,7 @@ typedef BOOL (WINAPI *ADJUSTWINDOWRECTEX)(LPRECT,DWORD,BOOL,DWORD);
 typedef int (WINAPI *GETSYSTEMMETRICS)(int);
 typedef BOOL (WINAPI *SYSTEMPARAMETERSINFOA)(UINT,UINT,PVOID,UINT);
 typedef BOOL (WINAPI *SYSTEMPARAMETERSINFOW)(UINT,UINT,PVOID,UINT);
-typedef BOOL (__fastcall *FORCERESETUSERAPIHOOK)(HINSTANCE);
+typedef BOOL (WINAPI *FORCERESETUSERAPIHOOK)(HINSTANCE);
 typedef BOOL (WINAPI *DRAWFRAMECONTROL)(HDC,LPRECT,UINT,UINT);
 typedef BOOL (WINAPI *DRAWCAPTION)(HWND,HDC,LPCRECT,UINT);
 typedef BOOL (WINAPI *MDIREDRAWFRAME)(HWND,DWORD);
diff --git a/win32ss/user/user32/misc/usrapihk.c b/win32ss/user/user32/misc/usrapihk.c
index 8b5d264ee88..c2e91d5f3d9 100644
--- a/win32ss/user/user32/misc/usrapihk.c
+++ b/win32ss/user/user32/misc/usrapihk.c
@@ -113,7 +113,7 @@ BeginIfHookedUserApiHook(VOID)
 }
 
 BOOL
-FASTCALL
+WINAPI
 ForceResetUserApiHook(HINSTANCE hInstance)
 {
   if ( ghmodUserApiHook == hInstance &&