diff --git a/lib/generate.js b/lib/generate.js
index 05651dff5f..a08ccea8a3 100644
--- a/lib/generate.js
+++ b/lib/generate.js
@@ -9,6 +9,7 @@ const { resolve, join, dirname } = require('path')
 const copy = pify(fs.copy)
 const remove = pify(fs.remove)
 const writeFile = pify(fs.writeFile)
+const mkdirp = pify(fs.mkdirp)
 
 const defaults = {
   dir: 'dist',
@@ -53,8 +54,10 @@ module.exports = function () {
         debug('Generate file: ' + path)
         path = join(distPath, path)
         // Make sure the sub folders are created
-        fs.mkdirsSync(dirname(path))
-        return writeFile(path, html, 'utf8')
+        return co(function * () {
+          yield mkdirp(dirname(path))
+          yield writeFile(path, html, 'utf8')
+        })
       })
       promises.push(promise)
     })