diff --git a/lib/ace/lib/useragent.js b/lib/ace/lib/useragent.js
index b6989a8c..908a2a4c 100644
--- a/lib/ace/lib/useragent.js
+++ b/lib/ace/lib/useragent.js
@@ -76,7 +76,7 @@ exports.isLinux = (os == "linux");
 // Windows Store JavaScript apps (aka Metro apps written in HTML5 and JavaScript) do not use the "Microsoft Internet Explorer" string in their user agent, but "MSAppHost" instead.
 exports.isIE = 
     (navigator.appName == "Microsoft Internet Explorer" || navigator.appName.indexOf("MSAppHost") >= 0)
-    && parseFloat(navigator.userAgent.match(/MSIE ([0-9]+[\.0-9]+)/)[1]);
+    && parseFloat(navigator.userAgent.match(/(?:Trident\/[0-9]+[\.0-9]+;.*rv:|MSIE )([0-9]+[\.0-9]+)/)[1]);
     
 exports.isOldIE = exports.isIE && exports.isIE < 9;