diff --git a/setup.cfg b/setup.cfg
index f775bd821..73bc8debb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -84,7 +84,6 @@ nova.api.v21.extensions =
     consoles = nova.api.openstack.compute.consoles:Consoles
     create_backup = nova.api.openstack.compute.create_backup:CreateBackup
     deferred_delete = nova.api.openstack.compute.deferred_delete:DeferredDelete
-    disk_config = nova.api.openstack.compute.disk_config:DiskConfig
     evacuate = nova.api.openstack.compute.evacuate:Evacuate
     extended_availability_zone = nova.api.openstack.compute.extended_availability_zone:ExtendedAvailabilityZone
     extended_server_attributes = nova.api.openstack.compute.extended_server_attributes:ExtendedServerAttributes