diff --git a/combo/config/from_parameters.py b/combo/config/from_parameters.py
index e948ebc8a39814d94ce680b0d15952ed69b24498..138077065f73ed9f880ffef547bc7ff1ede81d34 100644
--- a/combo/config/from_parameters.py
+++ b/combo/config/from_parameters.py
@@ -1,7 +1,6 @@
 import functools
 import inspect
 import typing
-from types import NoneType
 from typing import Any, Callable, Dict, List, Optional
 
 from combo.common.params import Params