diff --git a/zipline/finance/trading.py b/zipline/finance/trading.py
index 7a4ebd38..502d0637 100644
--- a/zipline/finance/trading.py
+++ b/zipline/finance/trading.py
@@ -21,9 +21,9 @@ from collections import defaultdict
 
 import zipline.protocol as zp
 from zipline.finance.slippage import (
-        VolumeShareSlippage,
-        transact_partial
-    )
+    VolumeShareSlippage,
+    transact_partial
+)
 from zipline.finance.commission import PerShare
 
 log = logbook.Logger('Transaction Simulator')