diff --git a/source/Ox.UI/js/Core/URL.js b/source/Ox.UI/js/Core/URL.js
index 150b64b6..d437ad38 100644
--- a/source/Ox.UI/js/Core/URL.js
+++ b/source/Ox.UI/js/Core/URL.js
@@ -394,12 +394,12 @@ Ox.URL = function(options) {
     self.previousTitle = '';
     self.previousURL = '';
 
-    window.onpopstate = function() {
+    window.addEventListener('popstate', function() {
         self.previousTitle = document.title;
         self.previousURL = document.location.pathname
             + document.location.search
             + document.location.hash;
-    };
+    });
 
     function constructCondition(condition) {
         var key = condition.key == '*' ? '' : condition.key,