diff --git a/system/modules/isotope/templates/modules/mod_iso_productlist_caching.html5 b/system/modules/isotope/templates/modules/mod_iso_productlist_caching.html5
index f04790e2ca..4a169456b2 100644
--- a/system/modules/isotope/templates/modules/mod_iso_productlist_caching.html5
+++ b/system/modules/isotope/templates/modules/mod_iso_productlist_caching.html5
@@ -12,10 +12,11 @@
     (function() {
         Isotope.displayBox('<?= $this->message ?>');
 
-        var url = window.location.href + (document.location.search ? '&' : '?') + '&buildCache=1',
-            xhr = new XMLHttpRequest();
+        var url = new URL(window.location.href);
+        url.searchParams.set('buildCache', '1');
 
-        xhr.open('GET', encodeURI(url));
+        var xhr = new XMLHttpRequest();
+        xhr.open('GET', encodeURI(url.toString());
         xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
 
         xhr.onload = function() {
@@ -30,4 +31,4 @@
         xhr.send();
     })();
 </script>
-<?php $this->endblock(); ?>
\ No newline at end of file
+<?php $this->endblock(); ?>