diff --git a/lib/classes/event/badge_listing_viewed.php b/lib/classes/event/badge_listing_viewed.php
index 7ae6ae2f9a2..3554ce50c4b 100644
--- a/lib/classes/event/badge_listing_viewed.php
+++ b/lib/classes/event/badge_listing_viewed.php
@@ -24,7 +24,7 @@
 
 namespace core\event;
 defined('MOODLE_INTERNAL') || die();
-
+require_once($CFG->libdir . '/badgeslib.php');
 /**
  * Event triggered after a badge is viewed.
  *