Index: /trunk/src/VBox/Additions/common/VBoxService/VBoxServicePageSharing.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxService/VBoxServicePageSharing.cpp	(revision 29990)
+++ /trunk/src/VBox/Additions/common/VBoxService/VBoxServicePageSharing.cpp	(revision 29991)
@@ -194,5 +194,9 @@
                         }
                     }
+#ifdef GC_ARCH_BITS == 64
                     aRegions[idxRegion].GCRegionAddr = (RTGCPTR64)MemInfo.BaseAddress;
+#else
+                    aRegions[idxRegion].GCRegionAddr = (RTGCPTR32)MemInfo.BaseAddress;
+#endif
                     aRegions[idxRegion].cbRegion     = MemInfo.RegionSize;
                     idxRegion++;