diff --git a/static/js/oml.js b/static/js/oml.js
index f9e2b34..bebdf4c 100644
--- a/static/js/oml.js
+++ b/static/js/oml.js
@@ -230,6 +230,9 @@
             script = document.createElement('script');
         script.onload = function() {
             Ox.load({UI: {theme: theme}}, function() {
+                Ox.formatBoolean = function(value) {
+                    return value ? 'yes' : 'no';
+                };
                 Ox.formatUpper = function(string) {
                     return string.toUpperCase();
                 };