diff --git a/plone/app/discussion/tests/test_catalog.py b/plone/app/discussion/tests/test_catalog.py
index d85c8fc..5cb26a7 100644
--- a/plone/app/discussion/tests/test_catalog.py
+++ b/plone/app/discussion/tests/test_catalog.py
@@ -549,7 +549,7 @@ class CommentCatalogTest(unittest.TestCase):
                 'v': 'Comment',
             }]
 
-            self.assertEqual(len(collection.results()), 1)
+            self.assertEqual(collection.results().length, 1)
             self.assertEqual(collection.results()[0].text, 'Comment text')
             self.assertEqual(collection.results()[0].creator, 'jim')
             self.assertEqual(collection.results()[0].author_name, 'Jim')