diff --git a/zipline/data/us_equity_pricing.py b/zipline/data/us_equity_pricing.py
index b31a9021..87729dc3 100644
--- a/zipline/data/us_equity_pricing.py
+++ b/zipline/data/us_equity_pricing.py
@@ -15,7 +15,6 @@ from abc import (
     ABCMeta,
     abstractmethod,
 )
-from contextlib import contextmanager
 from errno import ENOENT
 from os import remove
 from os.path import exists