diff --git a/dlls/user32/driver.c b/dlls/user32/driver.c
index f769677d30d..54a888b16d9 100644
--- a/dlls/user32/driver.c
+++ b/dlls/user32/driver.c
@@ -305,6 +305,7 @@ static void CDECL nulldrv_GetDC( HDC hdc, HWND hwnd, HWND top_win, const RECT *w
 static DWORD CDECL nulldrv_MsgWaitForMultipleObjectsEx( DWORD count, const HANDLE *handles, DWORD timeout,
                                                         DWORD mask, DWORD flags )
 {
+    if (!count && !timeout) return WAIT_TIMEOUT;
     return WaitForMultipleObjectsEx( count, handles, flags & MWMO_WAITALL,
                                      timeout, flags & MWMO_ALERTABLE );
 }