diff --git a/source/Ox.UI/js/Core/Ox.URL.js b/source/Ox.UI/js/Core/Ox.URL.js
index 6606294c..2308332c 100644
--- a/source/Ox.UI/js/Core/Ox.URL.js
+++ b/source/Ox.UI/js/Core/Ox.URL.js
@@ -649,7 +649,9 @@ Ox.URL = function(options) {
     @*/
     that.pop = function() {
         if (self.previousURL) {
-            history.pushState({}, self.previousTitle, self.previousURL);
+            history.pushState && history.pushState(
+                {}, self.previousTitle, self.previousURL
+            );
             document.title = self.previousTitle;
         }
         return !!self.previousURL;
@@ -681,7 +683,9 @@ Ox.URL = function(options) {
                 + document.location.search
                 + document.location.hash;
             if (url != self.previousURL) {
-                history.pushState(Ox.extend(state, {title: title}), '', url);
+                history.pushState && history.pushState(
+                    Ox.extend(state, {title: title}), '', url
+                );
                 document.title = title;
                 callback && callback(state);
             }