Index: /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h
===================================================================
--- /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h	(revision 78197)
+++ /trunk/src/VBox/GuestHost/OpenGL/include/cr_unpack.h	(revision 78198)
@@ -101,5 +101,5 @@
     do \
     { \
-        if (RT_UNLIKELY((a_pState)->cbUnpackDataLeft < (a_cbAccess))) \
+        if (RT_UNLIKELY((a_pState)->cbUnpackDataLeft < (size_t)(a_cbAccess))) \
         { \
             (a_pState)->rcUnpack = VERR_BUFFER_OVERFLOW; \