diff --git a/next.config.js b/next.config.js
index 33c55f5050725e..19b335670d1eb4 100644
--- a/next.config.js
+++ b/next.config.js
@@ -31,7 +31,7 @@ module.exports = {
 
     return Object.assign({}, config, {
       plugins,
-      externals: Object.assign({}, {
+      externals: Object.assign({}, config.externals, {
         fs: 'fs',
       }),
       module: Object.assign({}, config.module, {