diff --git a/backup/restorelib.php b/backup/restorelib.php
index 8f1e61a1719..0aebd900155 100644
--- a/backup/restorelib.php
+++ b/backup/restorelib.php
@@ -93,6 +93,7 @@
         // TODO: process all html text also in blocks too
 
         // Restore links in questions.
+        require_once("$CFG->dirroot/question/restorelib.php");
         if (!defined('RESTORE_SILENTLY')) {
             echo '<li>' . get_string('from') . ' ' . get_string('questions', 'quiz');
         }