diff --git a/sigma/processing/condition_expressions.py b/sigma/processing/condition_expressions.py
index dfd92a7..4f3166b 100644
--- a/sigma/processing/condition_expressions.py
+++ b/sigma/processing/condition_expressions.py
@@ -3,7 +3,6 @@
 from typing import Callable, ClassVar, Dict, Iterable, Optional, Set, Union
 
 from pyparsing import (
-    List,
     ParseException,
     Word,
     alphanums,