Index: uspace/lib/c/include/sys/mman.h
===================================================================
--- uspace/lib/c/include/sys/mman.h	(revision 15f3c3fbb3cd87db466db2f9b1379fe5b0794299)
+++ uspace/lib/c/include/sys/mman.h	(revision 149956486aec381b969e725ecafbf5575e325e6e)
@@ -39,5 +39,5 @@
 #include <sys/types.h>
 
-#define MAP_FAILED  ((void *) -1)
+#define MAP_FAILED  AS_MAP_FAILED
 
 #define MAP_SHARED     (1 << 0)