Index: abi/include/mm/as.h
===================================================================
--- abi/include/mm/as.h	(revision c06994673347954891a57710998cf1e087a59e8b)
+++ abi/include/mm/as.h	(revision 33c29521d96b892e096419a2fd8beb867e2596f6)
@@ -37,8 +37,9 @@
 
 /** Address space area flags. */
-#define AS_AREA_READ       1
-#define AS_AREA_WRITE      2
-#define AS_AREA_EXEC       4
-#define AS_AREA_CACHEABLE  8
+#define AS_AREA_READ       0x01
+#define AS_AREA_WRITE      0x02
+#define AS_AREA_EXEC       0x04
+#define AS_AREA_CACHEABLE  0x08
+#define AS_AREA_GUARD      0x10
 
 /** Address space area info exported to uspace. */