diff -r fcece45ef507 -r 79de32ba3296 src/multimedia/audio/qaudiooutput_win32_p.h
--- a/src/multimedia/audio/qaudiooutput_win32_p.h	Mon May 03 13:17:34 2010 +0300
+++ b/src/multimedia/audio/qaudiooutput_win32_p.h	Fri May 14 16:40:13 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();