diff --git a/data/web/js/build/014-mailcow.js b/data/web/js/build/014-mailcow.js
index 8428c2a6..cbf51f3c 100644
--- a/data/web/js/build/014-mailcow.js
+++ b/data/web/js/build/014-mailcow.js
@@ -13,7 +13,16 @@ $(document).ready(function() {
   }
 
   // https://stackoverflow.com/questions/4399005/implementing-jquerys-shake-effect-with-animate
-  function shake(div,interval=100,distance=10,times=4) {
+  function shake(div,interval,distance,times) {
+      if(typeof interval === 'undefined') {
+        interval = 100;
+      }
+      if(typeof distance === 'undefined') {
+        distance = 10;
+      }
+      if(typeof times === 'undefined') {
+        times = 4;
+      }
     $(div).css('position','relative');
     for(var iter=0;iter<(times+1);iter++){
       $(div).animate({ left: ((iter%2==0 ? distance : distance*-1))}, interval);