diff --git a/zipline/utils/tradingcalendar.py b/zipline/utils/tradingcalendar.py
index 2c3db622..15893cec 100644
--- a/zipline/utils/tradingcalendar.py
+++ b/zipline/utils/tradingcalendar.py
@@ -15,7 +15,7 @@
 import pandas as pd
 import pytz
 
-from datetime import datetime, timedelta
+from datetime import datetime
 from dateutil import rrule
 from functools import partial