diff --git a/mod/quiz/grade.php b/mod/quiz/grade.php
index 9334731706f..ddc8c07ef91 100644
--- a/mod/quiz/grade.php
+++ b/mod/quiz/grade.php
@@ -26,6 +26,7 @@
 
 
 require_once(dirname(__FILE__) . '/../../config.php');
+require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');