diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 092a5d5d86..310bf903c1 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -3050,6 +3050,7 @@ function login_forum_box($forum_data)
 	page_header($user->lang['LOGIN'], false);
 
 	$template->assign_vars(array(
+		'S_LOGIN_ACTION'		=> build_url(array('f')),
 		'S_HIDDEN_FIELDS'		=> build_hidden_fields(array('f' => $forum_data['forum_id'])))
 	);