diff --git a/question/bank/managecategories/classes/question_category_list.php b/question/bank/managecategories/classes/question_category_list.php
index 42ff970b954..23f1b4d3994 100644
--- a/question/bank/managecategories/classes/question_category_list.php
+++ b/question/bank/managecategories/classes/question_category_list.php
@@ -19,6 +19,7 @@ namespace qbank_managecategories;
 defined('MOODLE_INTERNAL') || die();
 
 require_once($CFG->libdir. '/listlib.php');
+require_once($CFG->dirroot . '/question/editlib.php');
 
 use stdClass;
 use moodle_list;