diff --git a/headers/posix/sys/types.h b/headers/posix/sys/types.h
index 602ac6aace..66e5692cd2 100644
--- a/headers/posix/sys/types.h
+++ b/headers/posix/sys/types.h
@@ -39,6 +39,7 @@ typedef int                 nlink_t;
 typedef int          		daddr_t;
 typedef char *				caddr_t;
 
+typedef unsigned long		addr_t;
 
 #include <null.h>
 #include <size_t.h>