diff -r 93b982ccede2 -r 5daf16870df6 src/multimedia/audio/qaudioinput_win32_p.h
--- a/src/multimedia/audio/qaudioinput_win32_p.h	Mon Jun 21 22:38:13 2010 +0100
+++ b/src/multimedia/audio/qaudioinput_win32_p.h	Thu Jul 22 16:41:55 2010 +0100
@@ -62,6 +62,7 @@
 #include <QtCore/qstring.h>
 #include <QtCore/qstringlist.h>
 #include <QtCore/qdatetime.h>
+#include <QtCore/qmutex.h>
 
 #include <QtMultimedia/qaudio.h>
 #include <QtMultimedia/qaudiodeviceinfo.h>
@@ -122,9 +123,8 @@
     volatile int waveFreeBlockCount;
     int waveCurrentBlock;
 
-    CRITICAL_SECTION waveInCriticalSection;
-
-    static void CALLBACK waveInProc( HWAVEIN hWaveIn, UINT uMsg,
+    QMutex mutex;
+    static void QT_WIN_CALLBACK waveInProc( HWAVEIN hWaveIn, UINT uMsg,
             DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 );
 
     WAVEHDR* allocateBlocks(int size, int count);