diff --git a/lib/cronlib.php b/lib/cronlib.php
index 81e3ceb56dd..743302dacb9 100644
--- a/lib/cronlib.php
+++ b/lib/cronlib.php
@@ -424,7 +424,7 @@ function cron_run() {
 
     //Run registration updated cron
     mtrace(get_string('siteupdatesstart', 'hub'));
-    require_once($CFG->dirroot . "/$CFG->admin/registration/lib.php");
+    require_once($CFG->dirroot . '/' . $CFG->admin . '/registration/lib.php');
     $registrationmanager = new registration_manager();
     $registrationmanager->cron();
     mtrace(get_string('siteupdatesend', 'hub'));