diff --git a/caravel/assets/visualizations/nvd3_vis.js b/caravel/assets/visualizations/nvd3_vis.js
index fc63b6d03810d..71de1a0f52197 100644
--- a/caravel/assets/visualizations/nvd3_vis.js
+++ b/caravel/assets/visualizations/nvd3_vis.js
@@ -10,14 +10,13 @@ require('./nvd3_vis.css');
 
 function nvd3Vis(slice) {
   var chart;
+  var colorKey = 'key';
 
   var render = function () {
     $.getJSON(slice.jsonEndpoint(), function (payload) {
         var fd = payload.form_data;
         var viz_type = fd.viz_type;
-
         var f = d3.format('.3s');
-        var colorKey = 'key';
 
         nv.addGraph(function () {
           if (!chart) {
@@ -196,7 +195,6 @@ function nvd3Vis(slice) {
               chart.y2Axis.tickFormat(d3.format(fd.y_axis_format));
             }
           }
-
           chart.color(function (d, i) {
             return px.color.category21(d[colorKey]);
           });