diff --git a/packages/next/src/build/webpack/plugins/middleware-plugin.ts b/packages/next/src/build/webpack/plugins/middleware-plugin.ts
index 2326779ad8d9ae..70c80564b1ed3b 100644
--- a/packages/next/src/build/webpack/plugins/middleware-plugin.ts
+++ b/packages/next/src/build/webpack/plugins/middleware-plugin.ts
@@ -120,7 +120,7 @@ function getEntryFiles(
           .map(
             (file) =>
               'server/' +
-              file.replace('.js', '_' + CLIENT_REFERENCE_MANIFEST + '.js')
+              file.replace(/\.js$/, '_' + CLIENT_REFERENCE_MANIFEST + '.js')
           )
       )
     }