diff --git a/source/Ox/js/Format.js b/source/Ox/js/Format.js
index 95460b9a..d3049f35 100644
--- a/source/Ox/js/Format.js
+++ b/source/Ox/js/Format.js
@@ -348,7 +348,9 @@ Ox.formatDate <f> Formats a date according to a format string
         }
         date = Ox.makeDate(date);
         format.forEach(function(value) {
-            string = string.replace(value[0], value[1](date, utc));
+            string = string.replace(value[0], function() {
+                return value[1](date, utc);
+            });
         });
         return string;
     };