diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index e1f96c0b1e..dd0dcc09b6 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -5124,7 +5124,7 @@ function phpbb_build_hidden_fields_for_query_params($request, $exclude = null)
 function page_header($page_title = '', $display_online_list = true, $item_id = 0, $item = 'forum')
 {
 	global $db, $config, $template, $SID, $_SID, $_EXTRA_URL, $user, $auth, $phpEx, $phpbb_root_path;
-	global $phpbb_dispatcher, $request, $phpbb_container, $adm_relative_path;
+	global $phpbb_dispatcher, $request, $phpbb_container, $phpbb_admin_path;
 
 	if (defined('HEADER_INC'))
 	{
@@ -5423,7 +5423,7 @@ function page_header($page_title = '', $display_online_list = true, $item_id = 0
 		'S_FORUM_ID'			=> $forum_id,
 		'S_TOPIC_ID'			=> $topic_id,
 
-		'S_LOGIN_ACTION'		=> ((!defined('ADMIN_START')) ? append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=login') : append_sid("{$phpbb_root_path}{$adm_relative_path}index.$phpEx", false, true, $user->session_id)),
+		'S_LOGIN_ACTION'		=> ((!defined('ADMIN_START')) ? append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=login') : append_sid("{$phpbb_admin_path}index.$phpEx", false, true, $user->session_id)),
 		'S_LOGIN_REDIRECT'		=> build_hidden_fields(array('redirect' => build_url())),
 
 		'S_ENABLE_FEEDS'			=> ($config['feed_enable']) ? true : false,