diff --git a/extensions/limits/__init__.py b/extensions/limits/__init__.py
index 7230dfa28..96e016929 100644
--- a/extensions/limits/__init__.py
+++ b/extensions/limits/__init__.py
@@ -20,7 +20,7 @@ import views
 baseurl = "limits"
 
 def init():
-    from modoboa.admin.models import User
+    from modoboa.admin.models import User, Domain
 
     ct = ContentType.objects.get(app_label="admin", model="domain")
     dagrp = Group.objects.get(name="DomainAdmins")