diff --git a/botocore/regions.py b/botocore/regions.py
index 20504521b4..4c23737270 100644
--- a/botocore/regions.py
+++ b/botocore/regions.py
@@ -454,6 +454,7 @@ class EndpointResolverBuiltins(str, Enum):
     ACCOUNT_ID = "AWS::Auth::AccountId"
     ACCOUNT_ID_ENDPOINT_MODE = "AWS::Auth::AccountIdEndpointMode"
 
+
 class EndpointRulesetResolver:
     """Resolves endpoints using a service's endpoint ruleset"""