diff --git a/UI/WebServerResources/generic.js b/UI/WebServerResources/generic.js
index f7794d656..20e3f5785 100644
--- a/UI/WebServerResources/generic.js
+++ b/UI/WebServerResources/generic.js
@@ -468,8 +468,8 @@ function triggerAjaxRequest(url, callback, userdata, content, headers, attempt)
         activeAjaxRequests++;
         document.animTimer = setTimeout("checkAjaxRequestsState();", 250);
 
-        if (Prototype.Browser.IE) {
-            // Prevent 304 HTTP status code from the server
+        if (navigator.userAgent.include('Trident')) {
+            // Prevent 304 HTTP status code from the server with IE
             if (url.indexOf('?') >= 0)
                 url += '&';
             else