diff --git a/plone/app/discussion/tests/test_contentrules.py b/plone/app/discussion/tests/test_contentrules.py
index edd5598..e7326ca 100644
--- a/plone/app/discussion/tests/test_contentrules.py
+++ b/plone/app/discussion/tests/test_contentrules.py
@@ -104,7 +104,7 @@ class ReplyContentRulesTest(unittest.TestCase):
         re_comment.author_email = "julia@example.com"
 
         replies = IReplies(comment)
-        new_re_id = replies.addComment(re_comment)
+        replies.addComment(re_comment)
 
     def testReplyIdStringSubstitution(self):
         reply_id = getAdapter(
diff --git a/plone/app/discussion/tests/test_events.py b/plone/app/discussion/tests/test_events.py
index e72de0c..ac65248 100644
--- a/plone/app/discussion/tests/test_events.py
+++ b/plone/app/discussion/tests/test_events.py
@@ -157,7 +157,7 @@ class RepliesEventsTest(unittest.TestCase):
         re_comment.text = 'Comment text'
 
         replies = IReplies(comment)
-        new_re_id = replies.addComment(re_comment)
+        replies.addComment(re_comment)
 
         self.assertTrue(self.registry.replyAdded)