Index: /trunk/src/VBox/Runtime/common/fs/extvfs.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/fs/extvfs.cpp	(revision 76293)
+++ /trunk/src/VBox/Runtime/common/fs/extvfs.cpp	(revision 76294)
@@ -1253,5 +1253,5 @@
     pThis->f64Bit          = false;
     pThis->cBlockShift     = 10 + RT_LE2H_U32(pSb->cLogBlockSize);
-    pThis->cbBlock         = 1 << pThis->cBlockShift;
+    pThis->cbBlock         = UINT64_C(1) << pThis->cBlockShift;
     pThis->cbInode         = sizeof(EXTINODE);
     pThis->cbBlkGrpDesc    = sizeof(EXTBLOCKGROUPDESC32);