diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index ecff98b1245..1a7f9e0c32d 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -4438,6 +4438,7 @@ function complete_user_login($user) {
             if ($changeurl = $userauth->change_password_url()) {
                 redirect($changeurl);
             } else {
+                require_once($CFG->dirroot . '/login/lib.php');
                 $SESSION->wantsurl = core_login_get_return_url();
                 redirect($CFG->httpswwwroot.'/login/change_password.php');
             }