Index: /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp	(revision 55066)
+++ /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp	(revision 55067)
@@ -1124,6 +1124,6 @@
 
     pMixBuf->Volume.fMuted = pVol->fMuted;
-    pMixBuf->Volume.uLeft  = (uint64_t(0x100000000 * pVol->uLeft)) / 255;
-    pMixBuf->Volume.uRight = (uint64_t(0x100000000 * pVol->uRight)) / 255;
+    pMixBuf->Volume.uLeft  = (UINT64_C(0x100000000) * pVol->uLeft) / 255;
+    pMixBuf->Volume.uRight = (UINT64_C(0x100000000) * pVol->uRight) / 255;
 
     LogFlowFunc(("\t-> lVol=%RU32, rVol=%RU32\n", pMixBuf->Volume.uLeft, pMixBuf->Volume.uRight));