Index: /trunk/src/VBox/Devices/Audio/AudioMixer.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 73645)
+++ /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 73646)
@@ -1761,5 +1761,5 @@
             cbToWriteStream -= (uint32_t)cbChunk;
 
-            cbWrittenStream += cbChunk;
+            cbWrittenStream += (uint32_t)cbChunk;
             Assert(cbWrittenStream <= cbBuf);
         }