diff --git a/heudiconv/dicoms.py b/heudiconv/dicoms.py
index 1dc11c7d..b7574c29 100644
--- a/heudiconv/dicoms.py
+++ b/heudiconv/dicoms.py
@@ -9,7 +9,7 @@
 from pathlib import Path
 import sys
 import tarfile
-from typing import TYPE_CHECKING, Any, Dict, List, NamedTuple, Optional, Union, Protocol, cast, overload
+from typing import TYPE_CHECKING, Any, Dict, Hashable, List, NamedTuple, Optional, Union, Protocol, overload
 from unittest.mock import patch
 import warnings