diff --git a/site/theme/index.js b/site/theme/index.js
index 65540abb6b..de4020646c 100644
--- a/site/theme/index.js
+++ b/site/theme/index.js
@@ -1,3 +1,4 @@
+require('core-js/es6/string');
 const path = require('path');
 
 const homeTmpl = './template/Home/index';