diff --git a/lib/webpack/createBaseConfig.js b/lib/webpack/createBaseConfig.js
index 3a43c95d35..02a664494b 100644
--- a/lib/webpack/createBaseConfig.js
+++ b/lib/webpack/createBaseConfig.js
@@ -212,6 +212,7 @@ module.exports = function createBaseConfig ({
   }
 
   createCSSRule('css', /\.css$/)
+  createCSSRule('postcss', /\.p(ost)?css$/)
   createCSSRule('scss', /\.scss$/, 'sass-loader', siteConfig.scss)
   createCSSRule('sass', /\.sass$/, 'sass-loader', Object.assign({ indentedSyntax: true }, siteConfig.sass))
   createCSSRule('less', /\.less$/, 'less-loader', siteConfig.less)