diff --git a/index.html b/index.html
index e825fda..6401963 100644
--- a/index.html
+++ b/index.html
@@ -83,6 +83,7 @@ permalink: /
{% raw %}
{% endraw %}
diff --git a/static/js/index.es6 b/static/js/index.es6
index 09dd904..c647fa2 100644
--- a/static/js/index.es6
+++ b/static/js/index.es6
@@ -51,6 +51,9 @@ window.refreshMirrorList = () => {
d['help_url'] = help_url[d['name']];
d['is_new'] = new_mirrors[d['name']];
d['show_status'] = (d.status != "success");
+ if (d['is_master'] === undefined) {
+ d['is_master'] = true;
+ }
// Strip the second component of last_update
if (d['last_update_ts']) {
let date = new Date(d['last_update_ts'] * 1000);