diff --git a/gulliver/system/class.rbac.php b/gulliver/system/class.rbac.php
index d41a8e1ea..93687574b 100644
--- a/gulliver/system/class.rbac.php
+++ b/gulliver/system/class.rbac.php
@@ -1776,7 +1776,7 @@ class RBAC
      */
     public static function isGuestUserUid($usrUid)
     {
-        if (RBAC::GUEST_USER_UID === $usrUid) {
+        if (self::GUEST_USER_UID === $usrUid) {
             return true;
         }
         return false;