diff --git a/ggplot/ggplot.py b/ggplot/ggplot.py
index ba12a6bd..91d31629 100755
--- a/ggplot/ggplot.py
+++ b/ggplot/ggplot.py
@@ -599,7 +599,10 @@ def _prep_layer_for_plotting(self, layer, facetgroup):
             if 'fill' in self._aes:
                 fillcol_raw = self._aes['fill'][:-5]
                 fillcol = self._aes['fill']
-                fill_levels = self.data[[fillcol_raw, fillcol]].sort(fillcol_raw)[fillcol].unique()
+                try:  # change in Pandas-0.19
+                    fill_levels = self.data[[fillcol_raw, fillcol]].sort_values(by=fillcol_raw)[fillcol].unique()
+                except:  # before Pandas-0.19
+                    fill_levels = self.data[[fillcol_raw, fillcol]].sort(fillcol_raw)[fillcol].unique()
             else:
                 fill_levels = None
             return dict(x_levels=self.data[self._aes['x']].unique(), fill_levels=fill_levels, lookups=df)