diff --git a/addons/web/static/src/js/views/graph_widget.js b/addons/web/static/src/js/views/graph_widget.js
index a86ea35e449..048838ad9cd 100644
--- a/addons/web/static/src/js/views/graph_widget.js
+++ b/addons/web/static/src/js/views/graph_widget.js
@@ -301,6 +301,7 @@ return Widget.extend({
         });
         chart.xAxis.tickValues(tickValues)
             .tickFormat(tickFormat);
+        chart.yAxis.tickFormat(function(d) { return openerp.web.format_value(d, { type : 'float' });});
 
         chart(svg);
         this.to_remove = chart.update;