diff --git a/dlls/strmbase/outputqueue.c b/dlls/strmbase/outputqueue.c
index 88a49f810fb..e931923e0a3 100644
--- a/dlls/strmbase/outputqueue.c
+++ b/dlls/strmbase/outputqueue.c
@@ -127,6 +127,7 @@ HRESULT WINAPI OutputQueue_Destroy(OutputQueue *pOutputQueue)
     SetEvent(pOutputQueue->hProcessQueue);
     LeaveCriticalSection(&pOutputQueue->csQueue);
 
+    pOutputQueue->csQueue.DebugInfo->Spare[0] = 0;
     DeleteCriticalSection(&pOutputQueue->csQueue);
     CloseHandle(pOutputQueue->hProcessQueue);