diff --git a/dlls/ole32/ole2.c b/dlls/ole32/ole2.c
index 6c0f8c1c673..0bb7437d3ef 100644
--- a/dlls/ole32/ole2.c
+++ b/dlls/ole32/ole2.c
@@ -1197,6 +1197,7 @@ static BOOL OLEMenu_InstallHooks( DWORD tid )
 
   pHookItem->tid = tid;
   pHookItem->hHeap = GetProcessHeap();
+  pHookItem->CallWndProc_hHook = NULL;
 
   /* Install a thread scope message hook for WH_GETMESSAGE */
   pHookItem->GetMsg_hHook = SetWindowsHookExW( WH_GETMESSAGE, OLEMenu_GetMsgProc,