diff --git a/tools/quake3/q3map2/q3map2.h b/tools/quake3/q3map2/q3map2.h
index d0f903fb..6c7b8893 100644
--- a/tools/quake3/q3map2/q3map2.h
+++ b/tools/quake3/q3map2/q3map2.h
@@ -2481,7 +2481,7 @@ Q_EXTERN bspAdvertisement_t	bspAds[ MAX_MAP_ADVERTISEMENTS ];
 				allocated = def; \
 			while(reqitem >= allocated && allocated) \
 				allocated *= 2; \
-			if(!allocated || allocated > 2147483647 / sizeof(*ptr)) \
+			if(!allocated || allocated > 2147483647 / (int)sizeof(*ptr)) \
 			{ \
 				Error(#ptr " over 2 GB"); \
 			} \