diff --git a/src/dynamodb_encryption_sdk/materials/__init__.py b/src/dynamodb_encryption_sdk/materials/__init__.py
index fcf1b7e6..e9d49e6e 100644
--- a/src/dynamodb_encryption_sdk/materials/__init__.py
+++ b/src/dynamodb_encryption_sdk/materials/__init__.py
@@ -16,10 +16,10 @@
 
 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")