diff --git a/setup.cfg b/setup.cfg
index 02e407da0..755192e62 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -72,7 +72,6 @@ wsgi_scripts =
     nova-metadata-wsgi = nova.api.metadata.wsgi:init_application
 
 nova.api.v21.extensions =
-    extension_info = nova.api.openstack.compute.extension_info:ExtensionInfo
     versions = nova.api.openstack.compute.versionsV21:Versions
 
 nova.api.v21.test_extensions =