Index: /trunk/src/VBox/Devices/Audio/DrvAudio.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DrvAudio.cpp	(revision 87876)
+++ /trunk/src/VBox/Devices/Audio/DrvAudio.cpp	(revision 87877)
@@ -1439,5 +1439,5 @@
 
     PPDMAUDIOFRAME paFrames = (PPDMAUDIOFRAME)pThis->pvScratchBuf;
-    const uint32_t  cFrames  =                 pThis->cbScratchBuf / sizeof(PDMAUDIOFRAME);
+    const uint32_t  cFrames =      (uint32_t)(pThis->cbScratchBuf / sizeof(PDMAUDIOFRAME));
 
     uint32_t cfLeft = cfToPlay;