diff --git a/dlls/wineqtdecoder/qtvdecoder.c b/dlls/wineqtdecoder/qtvdecoder.c
index 79e06a5cae3..8a41722df06 100644
--- a/dlls/wineqtdecoder/qtvdecoder.c
+++ b/dlls/wineqtdecoder/qtvdecoder.c
@@ -230,7 +230,9 @@ static void trackingCallback(
         IMediaSample_SetTime(pOutSample, &tStart, &tStop);
     }
 
+    LeaveCriticalSection(&This->tf.csReceive);
     hr = BaseOutputPinImpl_Deliver((BaseOutputPin*)This->tf.ppPins[1], pOutSample);
+    EnterCriticalSection(&This->tf.csReceive);
     if (hr != S_OK && hr != VFW_E_NOT_CONNECTED)
         ERR("Error sending sample (%x)\n", hr);