diff --git a/app/assets/javascripts/discourse/controllers/topic.js.es6 b/app/assets/javascripts/discourse/controllers/topic.js.es6
index efd6f8e0ebd..62190e5bcdc 100644
--- a/app/assets/javascripts/discourse/controllers/topic.js.es6
+++ b/app/assets/javascripts/discourse/controllers/topic.js.es6
@@ -514,7 +514,7 @@ export default Ember.Controller.extend(BufferedContent, {
     },
 
     changePostOwner(post) {
-      this.get("selectedPostIds").addObject(post.id);
+      this.set("selectedPostIds", [post.id]);
       this.send('changeOwner');
     },