diff --git a/caravel/viz.py b/caravel/viz.py
index 24727c2ec88d2..d81066fd1bc26 100644
--- a/caravel/viz.py
+++ b/caravel/viz.py
@@ -926,9 +926,8 @@ def get_df(self, query_obj=None):
 
     def get_data(self):
         df = self.get_df()
-        series = df.to_dict('series')
         chart_data = []
-        for name, ys in series.items():
+        for name, ys in df.iteritems():
             if df[name].dtype.kind not in "biufc":
                 continue
             if isinstance(name, string_types):