diff --git a/ietf/idtracker/urls.py b/ietf/idtracker/urls.py
index cce6586ab..7ccffc32e 100644
--- a/ietf/idtracker/urls.py
+++ b/ietf/idtracker/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls.defaults import patterns
+from django.conf.urls.defaults import patterns, handler404, handler500
 from ietf.idtracker.models import IDInternal, IDState, IDSubState, DocumentComment, BallotInfo
 from ietf.idtracker import views
 
diff --git a/ietf/liaisons/urls.py b/ietf/liaisons/urls.py
index b1ec937b9..0d5d28c51 100644
--- a/ietf/liaisons/urls.py
+++ b/ietf/liaisons/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls.defaults import patterns
+from django.conf.urls.defaults import patterns, handler404, handler500
 from ietf.liaisons.models import LiaisonDetail, LiaisonManagers
 
 info_dict = {
diff --git a/ietf/mailinglists/urls.py b/ietf/mailinglists/urls.py
index 51c817dc4..5fac2afde 100644
--- a/ietf/mailinglists/urls.py
+++ b/ietf/mailinglists/urls.py
@@ -1,4 +1,4 @@
-from django.conf.urls.defaults import patterns
+from django.conf.urls.defaults import patterns, handler404, handler500
 from ietf.idtracker.models import Area
 from ietf.mailinglists import views
 from ietf.mailinglists.models import NonWgMailingList