diff --git a/question/type/multichoice/db/upgrade.php b/question/type/multichoice/db/upgrade.php
index 501af6ce8c4e6..b9ca6f3f32240 100644
--- a/question/type/multichoice/db/upgrade.php
+++ b/question/type/multichoice/db/upgrade.php
@@ -21,7 +21,7 @@
 // before any action that may take longer time to finish.
 
 function xmldb_qtype_multichoice_upgrade($oldversion) {
-    global $CFG, $DB;
+    global $CFG, $DB, $QTYPES;
 
     $dbman = $DB->get_manager();
     $result = true;