diff --git a/superset/assets/src/visualizations/nvd3_vis.js b/superset/assets/src/visualizations/nvd3_vis.js
index 4dcdb4087e..33694dddf4 100644
--- a/superset/assets/src/visualizations/nvd3_vis.js
+++ b/superset/assets/src/visualizations/nvd3_vis.js
@@ -324,13 +324,15 @@ export default function nvd3Vis(slice, payload) {
         chart.showDistY(true);
         chart.tooltip.contentGenerator(function (obj) {
           const p = obj.point;
+          const yAxisFormatter = d3FormatPreset(fd.y_axis_format);
+          const xAxisFormatter = d3FormatPreset(fd.x_axis_format);
           let s = '<table>';
           s += (
             `<tr><td style="color: ${p.color};">` +
               `<strong>${p[fd.entity]}</strong> (${p.group})` +
             '</td></tr>');
-          s += row(fd.x, formatter(p.x));
-          s += row(fd.y, formatter(p.y));
+          s += row(fd.x, xAxisFormatter(p.x));
+          s += row(fd.y, yAxisFormatter(p.y));
           s += row(fd.size, formatter(p.size));
           s += '</table>';
           return s;
@@ -412,15 +414,13 @@ export default function nvd3Vis(slice, payload) {
       chart.xAxis.tickFormat(xAxisFormatter);
     }
 
-    const yAxisFormatter = d3FormatPreset(fd.y_axis_format);
+    let yAxisFormatter = d3FormatPreset(fd.y_axis_format);
     if (chart.yAxis && chart.yAxis.tickFormat) {
       if (fd.contribution || fd.comparison_type === 'percentage') {
         // When computing a "Percentage" or "Contribution" selected, we force a percentage format
-        const percentageFormat = d3.format('.1%');
-        chart.yAxis.tickFormat(percentageFormat);
-      } else {
-        chart.yAxis.tickFormat(yAxisFormatter);
+        yAxisFormatter = d3.format('.1%');
       }
+      chart.yAxis.tickFormat(yAxisFormatter);
     }
     if (chart.y2Axis && chart.y2Axis.tickFormat) {
       chart.y2Axis.tickFormat(yAxisFormatter);