diff --git a/app/assets/javascripts/discourse/components/topic-timeline.js.es6 b/app/assets/javascripts/discourse/components/topic-timeline.js.es6
index 5b1840250e..cc72ba7f2c 100644
--- a/app/assets/javascripts/discourse/components/topic-timeline.js.es6
+++ b/app/assets/javascripts/discourse/components/topic-timeline.js.es6
@@ -14,6 +14,7 @@ export default MountWidget.extend(Docking, {
       topic: this.get('topic'),
       topicTrackingState: this.topicTrackingState,
       enteredIndex: this.get('enteredIndex'),
+      dockAt: this.dockAt,
       dockBottom: this.dockBottom,
       mobileView: this.get('site.mobileView')
     };