diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index a2db6c13d32..b1ce7542210 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -852,7 +852,7 @@ openerp.web.form.WidgetButton = openerp.web.form.Widget.extend({
             });
         } else {
             if (this.node.attrs.confirm) {
-                var dialog = $('<div>' + this.node.attrs.confirm + '</div>').dialog({
+                $('<div>' + this.node.attrs.confirm + '</div>').dialog({
                     title: 'Confirm',
                     modal: true,
                     buttons: {