Index: /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h
===================================================================
--- /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h	(revision 78195)
+++ /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h	(revision 78196)
@@ -160,5 +160,5 @@
 #define DATA_POINTER(a_pState, offset, type )   ((type *) (crUnpackAccessChk((a_pState), int_cbAccessVerified, (offset), 0)) )
 
-#define DATA_POINTER_CHECK(a_pState, offset )   ((offset) < (a_pState)->cbUnpackDataLeft)
+#define DATA_POINTER_CHECK(a_pState, offset )   ((size_t)(offset) < (a_pState)->cbUnpackDataLeft)
 
 #define INCR_DATA_PTR(a_pState, delta ) \