Index: abi/include/mm/as.h
===================================================================
--- abi/include/mm/as.h	(revision 983cabe81d6e99396d661e20ad33116d7fb180a9)
+++ abi/include/mm/as.h	(revision 2d53cfc34c0cd9bc880bc3aa5bcc67546a00ea44)
@@ -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. */