diff --git a/pyheadermilter/__init__.py b/pyheadermilter/__init__.py
index 434eae3..95225bb 100644
--- a/pyheadermilter/__init__.py
+++ b/pyheadermilter/__init__.py
@@ -19,7 +19,6 @@ import argparse
 import configparser
 import logging
 import logging.handlers
-import os
 import re
 import sys