diff --git a/packages/poi/lib/create-config.js b/packages/poi/lib/create-config.js
index 0668509d..2e71b185 100644
--- a/packages/poi/lib/create-config.js
+++ b/packages/poi/lib/create-config.js
@@ -214,9 +214,7 @@ module.exports = function ({
 
   config.plugin('constants')
     .use(webpack.DefinePlugin, [merge({
-      process: {
-        env
-      }
+      'process.env': env
     }, define && stringifyObject(define))])
 
   if (format === 'cjs') {