diff --git a/test/javascripts/models/post-stream-test.js.es6 b/test/javascripts/models/post-stream-test.js.es6
index f7795de6834..6feef3763d8 100644
--- a/test/javascripts/models/post-stream-test.js.es6
+++ b/test/javascripts/models/post-stream-test.js.es6
@@ -433,7 +433,7 @@ test('triggerNewPostInStream', function() {
   const postStream = buildStream(225566);
   const store = postStream.store;
 
-  sandbox.stub(postStream, 'appendMore');
+  sandbox.stub(postStream, 'appendMore').returns(new Ember.RSVP.resolve());
   sandbox.stub(postStream, "refresh").returns(new Ember.RSVP.resolve());
 
   postStream.triggerNewPostInStream(null);