diff --git a/addons/web_calendar/static/src/js/web_calendar.js b/addons/web_calendar/static/src/js/web_calendar.js
index d32cbe453ad367d1565de039a260e70869410edc..5f90f49acadb4ab2fa6c3fbf40d266e27c186a75 100644
--- a/addons/web_calendar/static/src/js/web_calendar.js
+++ b/addons/web_calendar/static/src/js/web_calendar.js
@@ -855,7 +855,7 @@ openerp.web_calendar = function(instance) {
             }
             else {
                 var pop = new instance.web.form.FormOpenPopup(this);
-                pop.show_element(this.dataset.model, id, this.dataset.get_context(), {
+                pop.show_element(this.dataset.model, parseInt(id), this.dataset.get_context(), {
                     title: _.str.sprintf(_t("View: %s"),title),
                     view_id: +this.open_popup_action,
                     res_id: id,