diff --git a/compiler_gym/util/gym_type_hints.py b/compiler_gym/util/gym_type_hints.py
index ef7b240cb..87c8200eb 100644
--- a/compiler_gym/util/gym_type_hints.py
+++ b/compiler_gym/util/gym_type_hints.py
@@ -2,8 +2,8 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-from typing import Any, Dict, List, Optional, Tuple, TypeVar, Union
 from enum import Enum
+from typing import Any, Dict, List, Optional, Tuple, TypeVar, Union
 
 # A JSON dictionary.
 JsonDictType = Dict[str, Any]