diff --git a/www/calendar/inner.js b/www/calendar/inner.js
index 8f449bd88..7a2e53c76 100644
--- a/www/calendar/inner.js
+++ b/www/calendar/inner.js
@@ -27,6 +27,7 @@ define([
     '/bower_components/file-saver/FileSaver.min.js',
     'css!/lib/calendar/tui-calendar.min.css',
     'css!/bower_components/components-font-awesome/css/font-awesome.min.css',
+    'css!/bower_components/bootstrap/dist/css/bootstrap.min.css',
     'less!/calendar/app-calendar.less',
 ], function (
     $,