diff -r cc75c76972ee -r c0432d11811c src/multimedia/audio/qaudiooutput_win32_p.h
--- a/src/multimedia/audio/qaudiooutput_win32_p.h	Wed Apr 21 12:15:23 2010 +0300
+++ b/src/multimedia/audio/qaudiooutput_win32_p.h	Wed Apr 21 20:15:53 2010 +0300
@@ -119,6 +119,8 @@
     static void CALLBACK waveOutProc( HWAVEOUT hWaveOut, UINT uMsg,
             DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 );
 
+    CRITICAL_SECTION waveOutCriticalSection;
+
     WAVEHDR* allocateBlocks(int size, int count);
     void freeBlocks(WAVEHDR* blockArray);
     bool open();