diff --git a/packages/playground/legacy/vite.config.js b/packages/playground/legacy/vite.config.js
index a8fc762cd501a4..e6a7697413c8f9 100644
--- a/packages/playground/legacy/vite.config.js
+++ b/packages/playground/legacy/vite.config.js
@@ -11,8 +11,6 @@ module.exports = {
 
   build: {
     // make tests faster
-    minify: false,
-
     rollupOptions: {
       output: {
         chunkFileNames(chunkInfo) {
diff --git a/packages/plugin-legacy/index.js b/packages/plugin-legacy/index.js
index 60f7f4a227ff03..f88b77c5f6a33e 100644
--- a/packages/plugin-legacy/index.js
+++ b/packages/plugin-legacy/index.js
@@ -96,6 +96,14 @@ function viteLegacyPlugin(options = {}) {
     name: 'vite:legacy-generate-polyfill-chunk',
     apply: 'build',
 
+    config() {
+      return {
+        build: {
+          minify: 'terser'
+        }
+      }
+    },
+
     configResolved(config) {
       if (!config.build.ssr && genLegacy && config.build.minify === 'esbuild') {
         throw new Error(