diff --git a/dlls/quartz/filesource.c b/dlls/quartz/filesource.c
index 2a6188a5fc7..2d4265d5f03 100644
--- a/dlls/quartz/filesource.c
+++ b/dlls/quartz/filesource.c
@@ -1251,7 +1251,7 @@ static HRESULT WINAPI FileAsyncReader_BeginFlush(IAsyncReader * iface)
     EnterCriticalSection(&filter->sample_cs);
 
     filter->flushing = TRUE;
-    CancelIo(filter->file);
+    CancelIoEx(filter->file, NULL);
     SetEvent(filter->handle_list[filter->samples]);
 
     LeaveCriticalSection(&filter->sample_cs);