diff --git a/phpBB/memberlist.php b/phpBB/memberlist.php
index 184eec390a..36220b7f26 100644
--- a/phpBB/memberlist.php
+++ b/phpBB/memberlist.php
@@ -152,7 +152,7 @@ switch ($mode)
 
 				'U_GROUP'		=> $u_group,
 				'U_VIEWPROFILE'	=> "{$phpbb_root_path}memberlist.$phpEx$SID&mode=viewprofile&u={$row['user_id']}",
-				'U_PM'			=> ($auth->acl_get('u_sendpm')) ? "{$phpbb_root_path}ucp.$phpEx$SID&i=pm&mode=compose&u=$user_id" : '')
+				'U_PM'			=> ($auth->acl_get('u_sendpm')) ? "{$phpbb_root_path}ucp.$phpEx$SID&i=pm&mode=compose&u={$row['user_id']}" : '')
 			);
 		}
 		$db->sql_freeresult($result);