Index: /trunk/src/VBox/Devices/Audio/AudioMixer.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 88312)
+++ /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 88313)
@@ -597,6 +597,6 @@
             if (RT_SUCCESS(rc))
             {
-                pMixStream->StatsCircBufSize = RTCircBufSize(pMixStream->pCircBuf);
-                pMixStream->StatsCircBufUsed = RTCircBufUsed(pMixStream->pCircBuf);
+                pMixStream->StatsCircBufSize = (uint32_t)RTCircBufSize(pMixStream->pCircBuf);
+                pMixStream->StatsCircBufUsed = (uint32_t)RTCircBufUsed(pMixStream->pCircBuf);
 
                 /*
@@ -1970,5 +1970,5 @@
     }
 
-    pMixStream->StatsCircBufUsed = RTCircBufUsed(pCircBuf);
+    pMixStream->StatsCircBufUsed = (uint32_t)RTCircBufUsed(pCircBuf);
     Log3Func(("[%s] cbWritten=%RU32\n", pMixStream->pszName, cbWritten));
 
@@ -2046,5 +2046,5 @@
 
                 pMixStream->tsLastReadWrittenNs = RTTimeNanoTS();
-                pMixStream->StatsCircBufUsed    = RTCircBufUsed(pCircBuf);
+                pMixStream->StatsCircBufUsed    = (uint32_t)RTCircBufUsed(pCircBuf);
                 Log3Func(("[%s] Mixer stream '%s' -> cbWrittenBuf=%RU32\n", pSink->pszName, pMixStream->pszName, cbToWrite));
             }
Index: /trunk/src/VBox/Devices/Audio/DevHdaStream.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DevHdaStream.cpp	(revision 88312)
+++ /trunk/src/VBox/Devices/Audio/DevHdaStream.cpp	(revision 88313)
@@ -1243,5 +1243,5 @@
      * Update the buffer statistics.
      */
-    pStreamR3->State.StatDmaBufUsed = RTCircBufUsed(pStreamR3->State.pCircBuf);
+    pStreamR3->State.StatDmaBufUsed = (uint32_t)RTCircBufUsed(pStreamR3->State.pCircBuf);
 }
 
@@ -1610,5 +1610,5 @@
 
     /* Update buffer stats. */
-    pStreamR3->State.StatDmaBufUsed = RTCircBufUsed(pStreamR3->State.pCircBuf);
+    pStreamR3->State.StatDmaBufUsed = (uint32_t)RTCircBufUsed(pStreamR3->State.pCircBuf);
 }
 
@@ -1879,5 +1879,5 @@
 
     /* Update buffer stats. */
-    pStreamR3->State.StatDmaBufUsed = RTCircBufUsed(pStreamR3->State.pCircBuf);
+    pStreamR3->State.StatDmaBufUsed = (uint32_t)RTCircBufUsed(pStreamR3->State.pCircBuf);
 
     /*