diff --git a/lib/accesslib.php b/lib/accesslib.php
index fb6dda914e0..d19100a6286 100755
--- a/lib/accesslib.php
+++ b/lib/accesslib.php
@@ -15,6 +15,7 @@
   */
 
 // permission definitions
+define('CAP_INHERIT', 0);
 define('CAP_ALLOW', 1);
 define('CAP_PREVENT', -1);
 define('CAP_PROHIBIT', -1000);