diff --git a/phpBB/includes/session.php b/phpBB/includes/session.php
index ee8a4094c7..6bc71da0c1 100644
--- a/phpBB/includes/session.php
+++ b/phpBB/includes/session.php
@@ -346,7 +346,7 @@ class phpbb_session
 		$session_id = $request->variable('sid', '');
 		if (defined('NEED_SID') && (empty($session_id) || $this->session_id !== $session_id))
 		{
-			send_status_line(401, 'Not authorized');
+			send_status_line(401, 'Unauthorized');
 			redirect(append_sid("{$phpbb_root_path}index.$phpEx"));
 		}