diff --git a/lib/lang.js b/lib/lang.js
index b23d6585..5132362a 100644
--- a/lib/lang.js
+++ b/lib/lang.js
@@ -1,5 +1,5 @@
 import { format } from 'date-fns';
-import { enUS, nl, zhCN, tr, ru, de, ja, es, mn } from 'date-fns/locale';
+import { enUS, nl, zhCN, tr, ru, de, ja, es } from 'date-fns/locale';
 import enMessages from 'lang-compiled/en-US.json';
 import nlMessages from 'lang-compiled/nl-NL.json';
 import zhCNMessages from 'lang-compiled/zh-CN.json';