diff --git a/src/utils/string/Format.js b/src/utils/string/Format.js
index 8572f6c1a..38bf94ad1 100644
--- a/src/utils/string/Format.js
+++ b/src/utils/string/Format.js
@@ -20,7 +20,7 @@
  */
 var Format = function (string, values)
 {
-    string.replace(/%([0-9]+)/g, function (s, n)
+    string = string.replace(/%([0-9]+)/g, function (s, n)
     {
         return values[Number(n) - 1];
     });