diff --git a/classes/service/discussion_service.php b/classes/service/discussion_service.php
index 51822a6e..e847718a 100644
--- a/classes/service/discussion_service.php
+++ b/classes/service/discussion_service.php
@@ -138,6 +138,7 @@ public function create_discussion_object($forum, $context, array $options = arra
             'mailnow'       => 0,
             'reveal'        => 0,
             'pinned'        => 0,
+            'timelocked'    => 0,
         );
         foreach ($options as $name => $value) {
             if (property_exists($discussion, $name)) {