diff --git a/zun/common/config.py b/zun/common/config.py
index 96a860fa1..6cd6b0df6 100644
--- a/zun/common/config.py
+++ b/zun/common/config.py
@@ -15,7 +15,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_config import cfg
 from oslo_middleware import cors
 
 from zun.common import rpc
@@ -38,22 +37,22 @@ def set_config_defaults():
 
 def set_cors_middleware_defaults():
     """Update default configuration options for oslo.middleware."""
-    cfg.set_defaults(cors.CORS_OPTS,
-                     allow_headers=['X-Auth-Token',
-                                    'X-Identity-Status',
-                                    'X-Roles',
-                                    'X-Service-Catalog',
-                                    'X-User-Id',
-                                    'X-Project-Id',
-                                    'X-OpenStack-Request-ID',
-                                    'X-Server-Management-Url'],
-                     expose_headers=['X-Auth-Token',
-                                     'X-Subject-Token',
-                                     'X-Service-Token',
-                                     'X-OpenStack-Request-ID',
-                                     'X-Server-Management-Url'],
-                     allow_methods=['GET',
-                                    'PUT',
-                                    'POST',
-                                    'DELETE',
-                                    'PATCH'])
+    cors.set_defaults(
+        allow_headers=['X-Auth-Token',
+                       'X-Identity-Status',
+                       'X-Roles',
+                       'X-Service-Catalog',
+                       'X-User-Id',
+                       'X-Project-Id',
+                       'X-OpenStack-Request-ID',
+                       'X-Server-Management-Url'],
+        expose_headers=['X-Auth-Token',
+                        'X-Subject-Token',
+                        'X-Service-Token',
+                        'X-OpenStack-Request-ID',
+                        'X-Server-Management-Url'],
+        allow_methods=['GET',
+                       'PUT',
+                       'POST',
+                       'DELETE',
+                       'PATCH'])