diff --git a/dlls/msvcp90/misc.c b/dlls/msvcp90/misc.c
index c8bb2bd3051..145e4dc7f73 100644
--- a/dlls/msvcp90/misc.c
+++ b/dlls/msvcp90/misc.c
@@ -653,7 +653,7 @@ void __cdecl _Call_onceEx(int *once, void (__cdecl *func)(void*), void *argv)
     LeaveCriticalSection(&call_once_cs);
 }
 
-void __cdecl call_once_func_wrapper(void *func)
+static void __cdecl call_once_func_wrapper(void *func)
 {
     ((void (__cdecl*)(void))func)();
 }