diff --git a/src/dynamodb_encryption_sdk/materials/__init__.py b/src/dynamodb_encryption_sdk/materials/__init__.py
index e9d49e6e..f2aac7f3 100644
--- a/src/dynamodb_encryption_sdk/materials/__init__.py
+++ b/src/dynamodb_encryption_sdk/materials/__init__.py
@@ -15,11 +15,10 @@
 from typing import Dict, Text
 
 import six
+from mypy_extensions import NoReturn
 
 from dynamodb_encryption_sdk.delegated_keys import DelegatedKey  # noqa pylint: disable=unused-import
 
-from mypy_extensions import NoReturn
-
 __all__ = ("CryptographicMaterials", "EncryptionMaterials", "DecryptionMaterials")