diff --git a/gateway/assets/script/bootstrap.js b/gateway/assets/script/bootstrap.js
index b863c1ca..c56fe532 100644
--- a/gateway/assets/script/bootstrap.js
+++ b/gateway/assets/script/bootstrap.js
@@ -320,8 +320,9 @@ app.controller("home", ['$scope', '$log', '$http', '$location', '$interval', '$f
 ]);
 
 function uuidv4() {
+    var cryptoInstance = window.crypto || window.msCrypto; // for IE11
     return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, function(c) {
-      return (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
+      return (c ^ cryptoInstance.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
     })
   }
   
\ No newline at end of file