diff --git a/moto/s3/exceptions.py b/moto/s3/exceptions.py
index f78e2494..c7d82ddf 100644
--- a/moto/s3/exceptions.py
+++ b/moto/s3/exceptions.py
@@ -179,6 +179,7 @@ class InvalidStorageClass(S3ClientError):
             "The storage class you specified is not valid",
             *args, **kwargs)
 
+
 class DuplicateTagKeys(S3ClientError):
     code = 400