Index: /trunk/src/VBox/Main/src-client/DrvAudioVRDE.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/DrvAudioVRDE.cpp	(revision 88468)
+++ /trunk/src/VBox/Main/src-client/DrvAudioVRDE.cpp	(revision 88469)
@@ -505,5 +505,5 @@
         /* Return frames instead of bytes here
          * (since we specified PDMAUDIOSTREAMLAYOUT_RAW as the audio data layout). */
-        return (uint32_t)PDMAudioPropsBytesToFrames(&pStreamVRDE->Cfg.Props, RTCircBufUsed(pStreamVRDE->In.pCircBuf));
+        return PDMAudioPropsBytesToFrames(&pStreamVRDE->Cfg.Props, (uint32_t)RTCircBufUsed(pStreamVRDE->In.pCircBuf));
     }
     return 0;