1 files changed, 2 insertions, 1 deletions

diff --git a/src/mailman/rest/urls.py b/src/mailman/rest/urls.py
index a0b871aa0..6c455ceb9 100644
--- a/src/mailman/rest/urls.py
+++ b/src/mailman/rest/urls.py
@@ -33,6 +33,7 @@ from zope.traversing.browser.interfaces import IAbsoluteURL
 
 from mailman.config import config
 from mailman.core.system import system
+from mailman.interfaces.listmanager import IListManager
 from mailman.rest.configuration import AdminWebServiceConfiguration
 from mailman.rest.webservice import AdminWebServiceApplication
 
@@ -81,7 +82,7 @@ class FallbackURLMapper(BasicURLMapper):
             return ''
         urls = {
             system: 'system',
-            config.db.list_manager: 'lists',
+            IListManager(config): 'lists',
             }
         return urls[ob]