diff --git a/phpBB/memberlist.php b/phpBB/memberlist.php
index 67ba4fed46..1116d58820 100644
--- a/phpBB/memberlist.php
+++ b/phpBB/memberlist.php
@@ -13,7 +13,7 @@
 
 // TODO
 // Add permission check for IM clients
-
+define('IN_PHPBB', true);
 $phpbb_root_path = './';
 $phpEx = substr(strrchr(__FILE__, '.'), 1);
 include($phpbb_root_path . 'common.'.$phpEx);