diff --git a/plone/app/discussion/conversation.py b/plone/app/discussion/conversation.py
index 540bf97..e73546a 100644
--- a/plone/app/discussion/conversation.py
+++ b/plone/app/discussion/conversation.py
@@ -80,7 +80,7 @@ class Conversation(Traversable, Persistent, Explicit):
     @property
     def total_comments(self):
         public_comments = [
-            x for x in self._comments.values()
+            x for x in self.values()
             if user_nobody.has_permission('View', x)
         ]
         return len(public_comments)