diff --git a/packages/@vue/cli-service/lib/commands/build/setPublicPath.js b/packages/@vue/cli-service/lib/commands/build/setPublicPath.js
index c83fbcad0d..ccf4222430 100644
--- a/packages/@vue/cli-service/lib/commands/build/setPublicPath.js
+++ b/packages/@vue/cli-service/lib/commands/build/setPublicPath.js
@@ -6,3 +6,6 @@ if (typeof window !== 'undefined') {
     __webpack_public_path__ = i[1] // eslint-disable-line
   }
 }
+
+// Indicate to webpack that this file can be concatenated
+export default null