diff --git a/workflow/engine/classes/model/GroupUser.php b/workflow/engine/classes/model/GroupUser.php
old mode 100644
new mode 100755
index a79d5dea9..aacf87a8c
--- a/workflow/engine/classes/model/GroupUser.php
+++ b/workflow/engine/classes/model/GroupUser.php
@@ -26,6 +26,7 @@
 
 require_once 'classes/model/om/BaseGroupUser.php';
 require_once 'classes/model/Content.php';
+require_once 'classes/model/Users.php';
 
 /**
  * Skeleton subclass for representing a row from the 'GROUP_USER' table.
@@ -117,4 +118,4 @@ class GroupUser extends BaseGroupUser {
 	  return $aRows;
   }
 
-} // GroupUser
\ No newline at end of file
+} // GroupUser