diff --git a/src/signal_documentation/settings.py b/src/signal_documentation/settings.py
index 1f9a149..351a8c9 100644
--- a/src/signal_documentation/settings.py
+++ b/src/signal_documentation/settings.py
@@ -11,6 +11,7 @@
 """
 import os
 import sys
+from distutils.util import strtobool
 from pathlib import Path
 from typing import Any