diff --git a/lib/webpack/createBaseConfig.js b/lib/webpack/createBaseConfig.js
index 01618157a1..8938798f6a 100644
--- a/lib/webpack/createBaseConfig.js
+++ b/lib/webpack/createBaseConfig.js
@@ -88,6 +88,7 @@ module.exports = function createBaseConfig ({
     isProd,
     isServer,
     config: (
+      (siteConfig.markdown ? JSON.stringify(siteConfig.markdown) : '') +
       (siteConfig.chainWebpack || '').toString() +
       (siteConfig.configureWebpack || '').toString()
     )