From 36fe79062496ced9b373d1a2a753f466c9e7ae7e Mon Sep 17 00:00:00 2001
From: John Ricklefs <jricklefs@quantopian.com>
Date: Wed, 7 Aug 2013 16:56:18 -0400
Subject: [PATCH] BUG: Update market_open value for performance when updating
 market_close.

---
 zipline/finance/performance.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zipline/finance/performance.py b/zipline/finance/performance.py
index c4b0a112..cc149f97 100644
--- a/zipline/finance/performance.py
+++ b/zipline/finance/performance.py
@@ -384,7 +384,7 @@ class PerformanceTracker(object):
         self.day_count += 1.0
         # move the market day markers forward
         if self.market_close < trading.environment.last_trading_day:
-            _, self.market_close = \
+            self.market_open, self.market_close = \
                 trading.environment.next_open_and_close(self.market_open)
         else:
             self.market_close = self.sim_params.last_close