diff --git a/plone/app/discussion/subscribers.py b/plone/app/discussion/subscribers.py
index c3717e5..0234c97 100644
--- a/plone/app/discussion/subscribers.py
+++ b/plone/app/discussion/subscribers.py
@@ -5,12 +5,10 @@ from Products.CMFCore.utils import getToolByName
 def index_object(obj, event):
     """Index the object when it is added/modified to the conversation.
     """
-    catalog = getToolByName(obj, 'portal_catalog')
-    return catalog.reindexObject(obj)
+    obj.indexObject()
 
 
 def unindex_object(obj, event):
     """Unindex the object when it is removed from the conversation.
     """
-    catalog = getToolByName(obj, 'portal_catalog')
-    return catalog.unindexObject(obj)
+    obj.unindexObject()