diff --git a/pkilint/pkix/certificate/certificate_extension.py b/pkilint/pkix/certificate/certificate_extension.py
index ba7e0d7..f1241b8 100644
--- a/pkilint/pkix/certificate/certificate_extension.py
+++ b/pkilint/pkix/certificate/certificate_extension.py
@@ -1,4 +1,4 @@
-from typing import NamedTuple, Set, List
+from typing import NamedTuple, Set
 
 import unicodedata
 from cryptography import exceptions