diff --git a/js/vanilla.dbkcalendar.js b/js/vanilla.dbkcalendar.js
index 463b980..bf8e32e 100644
--- a/js/vanilla.dbkcalendar.js
+++ b/js/vanilla.dbkcalendar.js
@@ -3,7 +3,7 @@
 */
 document.addEventListener("DOMContentLoaded", hackcal);
 
-function hackcal(p=1) {
+function hackcal(e,p=1) {
     var cal_uri = "/hackcal/?period="+p;
     var uri_regex = /(https?:\/\/([-\w\.]+)+(:\d+)?(\/([\w\/\-_\.\:]*(\?\S+)?)?)?)/ig