diff --git a/etc/magnum/api-paste.ini b/etc/magnum/api-paste.ini
index 67aab9d238..31ba068f80 100644
--- a/etc/magnum/api-paste.ini
+++ b/etc/magnum/api-paste.ini
@@ -12,7 +12,7 @@ paste.filter_factory = magnum.api.middleware.auth_token:AuthTokenMiddleware.fact
 paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:cors]
-paste.filter_factory =  oslo_middleware.cors:filter_factory
+paste.filter_factory = oslo_middleware.cors:filter_factory
 oslo_config_project = magnum
 
 [filter:healthcheck]
diff --git a/magnum/tests/unit/api/controllers/auth-paste.ini b/magnum/tests/unit/api/controllers/auth-paste.ini
index 237faf278e..34229a4dea 100644
--- a/magnum/tests/unit/api/controllers/auth-paste.ini
+++ b/magnum/tests/unit/api/controllers/auth-paste.ini
@@ -11,7 +11,7 @@ paste.filter_factory = magnum.api.middleware.auth_token:AuthTokenMiddleware.fact
 paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:cors]
-paste.filter_factory =  oslo_middleware.cors:filter_factory
+paste.filter_factory = oslo_middleware.cors:filter_factory
 oslo_config_project = magnum
 latent_allow_methods = GET, PUT, POST, DELETE, PATCH
 latent_allow_headers = X-Auth-Token, X-Identity-Status, X-Roles, X-Service-Catalog, X-User-Id, X-Tenant-Id, X-OpenStack-Request-ID
diff --git a/magnum/tests/unit/api/controllers/auth-root-access.ini b/magnum/tests/unit/api/controllers/auth-root-access.ini
index cd832e1598..8abdf3c936 100644
--- a/magnum/tests/unit/api/controllers/auth-root-access.ini
+++ b/magnum/tests/unit/api/controllers/auth-root-access.ini
@@ -12,7 +12,7 @@ paste.filter_factory = magnum.api.middleware.auth_token:AuthTokenMiddleware.fact
 paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:cors]
-paste.filter_factory =  oslo_middleware.cors:filter_factory
+paste.filter_factory = oslo_middleware.cors:filter_factory
 oslo_config_project = magnum
 latent_allow_methods = GET, PUT, POST, DELETE, PATCH
 latent_allow_headers = X-Auth-Token, X-Identity-Status, X-Roles, X-Service-Catalog, X-User-Id, X-Tenant-Id, X-OpenStack-Request-ID
diff --git a/magnum/tests/unit/api/controllers/auth-v1-access.ini b/magnum/tests/unit/api/controllers/auth-v1-access.ini
index b6b3981dea..64eb1820d1 100644
--- a/magnum/tests/unit/api/controllers/auth-v1-access.ini
+++ b/magnum/tests/unit/api/controllers/auth-v1-access.ini
@@ -12,7 +12,7 @@ paste.filter_factory = magnum.api.middleware.auth_token:AuthTokenMiddleware.fact
 paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:cors]
-paste.filter_factory =  oslo_middleware.cors:filter_factory
+paste.filter_factory = oslo_middleware.cors:filter_factory
 oslo_config_project = magnum
 latent_allow_methods = GET, PUT, POST, DELETE, PATCH
 latent_allow_headers = X-Auth-Token, X-Identity-Status, X-Roles, X-Service-Catalog, X-User-Id, X-Tenant-Id, X-OpenStack-Request-ID
diff --git a/magnum/tests/unit/api/controllers/noauth-paste.ini b/magnum/tests/unit/api/controllers/noauth-paste.ini
index 6c87f6464f..d7a74d2fe8 100644
--- a/magnum/tests/unit/api/controllers/noauth-paste.ini
+++ b/magnum/tests/unit/api/controllers/noauth-paste.ini
@@ -12,7 +12,7 @@ paste.filter_factory = magnum.api.middleware.auth_token:AuthTokenMiddleware.fact
 paste.filter_factory = oslo_middleware:RequestId.factory
 
 [filter:cors]
-paste.filter_factory =  oslo_middleware.cors:filter_factory
+paste.filter_factory = oslo_middleware.cors:filter_factory
 oslo_config_project = magnum
 latent_allow_methods = GET, PUT, POST, DELETE, PATCH
 latent_allow_headers = X-Auth-Token, X-Identity-Status, X-Roles, X-Service-Catalog, X-User-Id, X-Tenant-Id, X-OpenStack-Request-ID
diff --git a/tox.ini b/tox.ini
index fba1a7be5c..8daaa53a51 100644
--- a/tox.ini
+++ b/tox.ini
@@ -126,7 +126,7 @@ commands =
     oslo-config-generator --config-file etc/magnum/magnum-config-generator.conf
 
 [flake8]
-exclude =  .venv,.git,.tox,dist,*lib/python*,*egg,build,tools,releasenotes
+exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,tools,releasenotes
 
 [hacking]
 local-check-factory = magnum.hacking.checks.factory