diff --git a/warcprox/dedup.py b/warcprox/dedup.py
index 705b74a..4e38864 100644
--- a/warcprox/dedup.py
+++ b/warcprox/dedup.py
@@ -24,6 +24,7 @@ from __future__ import absolute_import
 import logging
 import os
 import json
+import sys
 from hanzo import warctools
 import warcprox
 import sqlite3