Index: uspace/lib/c/include/as.h
===================================================================
--- uspace/lib/c/include/as.h	(revision 7f9bc04099b4ea6abc107d022634d198c81254b2)
+++ uspace/lib/c/include/as.h	(revision e515a82717878d1a0549c75f5eebb3a907f2f15d)
@@ -56,5 +56,5 @@
 extern void *as_area_create(void *address, size_t size, int flags);
 extern int as_area_resize(void *address, size_t size, int flags);
-int as_area_change_flags(void *address, int flags);
+extern int as_area_change_flags(void *address, int flags);
 extern int as_area_destroy(void *address);
 extern void *set_maxheapsize(size_t mhs);