diff --git a/setup.cfg b/setup.cfg
index 3b913a287..1c86c2d2c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -73,9 +73,6 @@ wsgi_scripts =
     nova-api-wsgi = nova.api.openstack.compute.wsgi:init_application
     nova-metadata-wsgi = nova.api.metadata.wsgi:init_application
 
-nova.api.v21.extensions =
-    versions = nova.api.openstack.compute.versionsV21:Versions
-
 nova.api.v21.test_extensions =
     basic = nova.tests.unit.api.openstack.compute.basic:Basic
     microversions = nova.tests.unit.api.openstack.compute.microversions:Microversions