diff --git a/zipline/utils/factory.py b/zipline/utils/factory.py
index 9fa68f26..acf4a216 100644
--- a/zipline/utils/factory.py
+++ b/zipline/utils/factory.py
@@ -17,7 +17,6 @@
 """
 Factory functions to prepare useful data for tests.
 """
-import os
 import pytz
 import msgpack
 import random