diff --git a/zipline/data/data_portal.py b/zipline/data/data_portal.py
index ca5f0c2c..7fff4ac2 100644
--- a/zipline/data/data_portal.py
+++ b/zipline/data/data_portal.py
@@ -528,8 +528,6 @@ class DataPortal(object):
         }
         self._equity_minute_loader_array_data = {}
 
-        self._in_bts = False
-
     def _reindex_extra_source(self, df, source_date_index):
         return df.reindex(index=source_date_index, method='ffill')