diff --git a/source/Ox.UI/js/Core/Cookies.js b/source/Ox.UI/js/Core/Cookies.js
index a29e374b..4da89ae7 100644
--- a/source/Ox.UI/js/Core/Cookies.js
+++ b/source/Ox.UI/js/Core/Cookies.js
@@ -12,7 +12,7 @@ Ox.Cookies = function() {
         if (document.cookie && document.cookie != '') {
             document.cookie.split('; ').forEach(function(cookie) {
                 name = cookie.split('=')[0];
-                value[name] = decodeURIComponent(cookie.substring(name.length + 1));
+                value[name] = Ox.decodeURIComponent(cookie.substring(name.length + 1));
             });
         }
         return value;
diff --git a/source/Ox.UI/js/Core/URL.js b/source/Ox.UI/js/Core/URL.js
index b7a58546..a03dfa6a 100644
--- a/source/Ox.UI/js/Core/URL.js
+++ b/source/Ox.UI/js/Core/URL.js
@@ -563,7 +563,7 @@ Ox.URL = function(options) {
     }
 
     function decodeValue(value) {
-        return decodeURIComponent(value);
+        return Ox.decodeURIComponent(value);
     }
 
     function encodeValue(value) {
diff --git a/source/Ox/js/String.js b/source/Ox/js/String.js
index 8f28a701..128556a6 100644
--- a/source/Ox/js/String.js
+++ b/source/Ox/js/String.js
@@ -24,6 +24,24 @@ Ox.clean = function(string) {
     })).join('\n');
 };
 
+/*@
+Ox.decodeURIComponent <f> Decodes URI
+    Unlike window.decodeURI, this doesn't throw on trailing '%'.
+    (string) -> <s> Decoded string
+@*/
+Ox.decodeURI = function(string) {
+    return decodeURIComponent(string.replace(/%(?![0-7][0-9A-F])/g, '%25'));
+};
+
+/*@
+Ox.decodeURIComponent <f> Decodes URI component
+    Unlike window.decodeURIComponent, this doesn't throw on trailing '%'.
+    (string) -> <s> Decoded string
+@*/
+Ox.decodeURIComponent = function(string) {
+    return decodeURIComponent(string.replace(/%(?![0-7][0-9A-F])/g, '%25'));
+};
+
 /*@
 Ox.endsWith <f> Tests if a string ends with a given substring
     Equivalent to `new RegExp(Ox.escapeRegExp(substring) + '$').test(string)`.