diff --git a/zipline/utils/tradingcalendar_bmf.py b/zipline/utils/tradingcalendar_bmf.py
index 98b2c1e4..d26c8c37 100644
--- a/zipline/utils/tradingcalendar_bmf.py
+++ b/zipline/utils/tradingcalendar_bmf.py
@@ -293,8 +293,8 @@ def get_open_and_closes(trading_days, early_closes):
                 hour=16),
             tz='America/Sao_Paulo').tz_convert('UTC')
 
-        open_and_closes.ix[day]['market_open'] = market_open
-        open_and_closes.ix[day]['market_close'] = market_close
+        open_and_closes.loc[day, 'market_open'] = market_open
+        open_and_closes.loc[day, 'market_close'] = market_close
 
     return open_and_closes
 
diff --git a/zipline/utils/tradingcalendar_tse.py b/zipline/utils/tradingcalendar_tse.py
index 74995026..ad53d987 100644
--- a/zipline/utils/tradingcalendar_tse.py
+++ b/zipline/utils/tradingcalendar_tse.py
@@ -360,8 +360,8 @@ def get_open_and_closes(trading_days, early_closes, tz='US/Eastern'):
                 hour=close_hour),
             tz='US/Eastern').tz_convert('UTC')
 
-        open_and_closes.ix[day]['market_open'] = market_open
-        open_and_closes.ix[day]['market_close'] = market_close
+        open_and_closes.loc[day, 'market_open'] = market_open
+        open_and_closes.loc[day, 'market_close'] = market_close
 
     return open_and_closes