diff --git a/classes/local/outagelib.php b/classes/local/outagelib.php
index 43edb6f..287d94c 100644
--- a/classes/local/outagelib.php
+++ b/classes/local/outagelib.php
@@ -253,6 +253,7 @@ class outagelib {
 if ((time() >= {{STARTTIME}}) && (time() < {{STOPTIME}})) {
     define('MOODLE_INTERNAL', true);
     require_once($CFG->dirroot.'/lib/moodlelib.php');
+    require_once($CFG->dirroot.'/lib/classes/ip_utils.php');
     if (!remoteip_in_list('{{ALLOWEDIPS}}')) {
         header($_SERVER['SERVER_PROTOCOL'] . ' 503 Moodle under maintenance');
         header('Status: 503 Moodle under maintenance');