diff --git a/backup/moodle2/backup_moodleoverflow_stepslib.php b/backup/moodle2/backup_moodleoverflow_stepslib.php
index 34c7d7d735..5067230bb3 100644
--- a/backup/moodle2/backup_moodleoverflow_stepslib.php
+++ b/backup/moodle2/backup_moodleoverflow_stepslib.php
@@ -48,46 +48,35 @@ protected function define_structure() {
             'name', 'intro', 'introformat', 'maxbytes', 'maxattachments', 'timecreated', 'timemodified',
             'forcesubscribe', 'trackingtype', 'ratingpreference', 'coursewidereputation', 'allowrating',
             'allowreputation', 'allownegativereputation', 'grademaxgrade', 'gradescalefactor', 'gradecat',
-            'anonymous', 'needsreview', 'allowmultiplemarks', ]);
+            'anonymous', 'allowmultiplemarks', ]);
 
         // Define each element separated.
         $discussions = new backup_nested_element('discussions');
         $discussion = new backup_nested_element('discussion', ['id'], [
-            'name', 'firstpost', 'userid', 'timemodified', 'usermodified', 'timestart', ]);
+            'name', 'firstpost', 'userid', 'timestart', 'timemodified', 'usermodified', ]);
 
         $posts = new backup_nested_element('posts');
-
         $post = new backup_nested_element('post', ['id'], [
             'parent', 'userid', 'created', 'modified',
-            'mailed', 'message', 'messageformat', 'attachment', ]);
+            'message', 'messageformat', 'attachment', 'mailed', ]);
 
         $ratings = new backup_nested_element('ratings');
-
         $rating = new backup_nested_element('rating', ['id'], [
             'userid', 'rating', 'firstrated', 'lastchanged', ]);
 
         $discussionsubs = new backup_nested_element('discuss_subs');
-
         $discussionsub = new backup_nested_element('discuss_sub', ['id'], [
-            'userid',
-            'preference',
-        ]);
+            'userid', 'preference', ]);
 
         $subscriptions = new backup_nested_element('subscriptions');
-
-        $subscription = new backup_nested_element('subscription', ['id'], [
-            'userid', ]);
+        $subscription = new backup_nested_element('subscription', ['id'], ['userid']);
 
         $readposts = new backup_nested_element('readposts');
-
         $read = new backup_nested_element('read', ['id'], [
-            'userid', 'discussionid', 'postid', 'firstread',
-            'lastread', ]);
+            'userid', 'discussionid', 'postid', 'firstread', 'lastread', ]);
 
         $tracking = new backup_nested_element('tracking');
-
-        $track = new backup_nested_element('track', ['id'], [
-            'userid', ]);
+        $track = new backup_nested_element('track', ['id'], ['userid']);
 
         // Build the tree.
         $moodleoverflow->add_child($discussions);