Index: uspace/lib/c/include/as.h
===================================================================
--- uspace/lib/c/include/as.h	(revision 32d19f757b014501ef88e20a2fa7d354e4bc0b39)
+++ uspace/lib/c/include/as.h	(revision faba83975da4ba5bb605f70d4e02e065f9513e84)
@@ -41,4 +41,7 @@
 #include <libarch/config.h>
 
+#define AS_AREA_ANY    ((void *) -1)
+#define AS_MAP_FAILED  ((void *) -1)
+
 static inline size_t SIZE2PAGES(size_t size)
 {
Index: uspace/lib/c/include/sys/mman.h
===================================================================
--- uspace/lib/c/include/sys/mman.h	(revision 32d19f757b014501ef88e20a2fa7d354e4bc0b39)
+++ uspace/lib/c/include/sys/mman.h	(revision faba83975da4ba5bb605f70d4e02e065f9513e84)
@@ -39,5 +39,5 @@
 #include <sys/types.h>
 
-#define MAP_FAILED  ((void *) -1)
+#define MAP_FAILED  AS_MAP_FAILED
 
 #define MAP_SHARED     (1 << 0)