diff --git a/packages/router/tsdown.config.ts b/packages/router/tsdown.config.ts
index 987b77262..eef1e839c 100644
--- a/packages/router/tsdown.config.ts
+++ b/packages/router/tsdown.config.ts
@@ -79,6 +79,7 @@ const esmBrowser = {
 
 const esmBrowserProd = {
   ...esmBrowser,
+  target: 'es2015',
   minify: true,
   outputOptions: {
     ...esmBrowser.outputOptions,
@@ -135,6 +136,7 @@ const iife = {
 
 const iifeProd = {
   ...iife,
+  target: 'es2015',
   minify: true,
   outputOptions: {
     ...iife.outputOptions,