diff --git a/plone/app/discussion/conversation.py b/plone/app/discussion/conversation.py
index 6fd488f..935229f 100644
--- a/plone/app/discussion/conversation.py
+++ b/plone/app/discussion/conversation.py
@@ -317,6 +317,10 @@ class Conversation(Traversable, Persistent, Explicit):
         if not suppress_container_modified:
             notify(ContainerModifiedEvent(self))
 
+        # XXX: This shouldn't be necessary.
+        content_obj = aq_parent(self)
+        content_obj.reindexObject()
+
     def __iter__(self):
         return iter(self._comments)