diff --git a/ckanext/c3charts/fanstatic/charts.js b/ckanext/c3charts/fanstatic/charts.js
index 61c22bb..555c4eb 100644
--- a/ckanext/c3charts/fanstatic/charts.js
+++ b/ckanext/c3charts/fanstatic/charts.js
@@ -140,6 +140,15 @@ this.ckan.views.c3charts = this.ckan.views.c3charts || {};
         var chartContainer = $(elementId).parent();
         var width = chartContainer.attr('data-graph_width');
         var height = chartContainer.attr('data-graph_height');
+        var tooltip = {};
+
+        if (chart_type === 'pie') {
+            tooltip = {
+              format: {
+                value: function (value, ratio, id, index) { return value; }
+              }
+            }
+        }
 
         return {
             size: {
@@ -204,7 +213,8 @@ this.ckan.views.c3charts = this.ckan.views.c3charts || {};
                     show: !! resourceView.y_grid
                 }
             },
-            legend: legend
+            legend: legend,
+            tooltip: tooltip
         }
     }