diff --git a/backup/lib.php b/backup/lib.php
index f365c41a517..7725bded125 100644
--- a/backup/lib.php
+++ b/backup/lib.php
@@ -847,6 +847,7 @@
         $preferences->backup_course_files = (isset($prefs['backup_course_files']) ? $prefs['backup_course_files'] : 0);
         $preferences->backup_site_files = (isset($prefs['backup_site_files']) ? $prefs['backup_site_files'] : 0);
         $preferences->backup_messages = (isset($prefs['backup_messages']) ? $prefs['backup_messages'] : 0);
+        $preferences->backup_gradebook_history = (isset($prefs['backup_gradebook_history']) ? $prefs['backup_gradebook_history'] : 0);
         $preferences->backup_course = $course->id;
         backup_add_static_preferences($preferences);
         return $preferences;