diff --git a/examples/sites/vite.config.ts b/examples/sites/vite.config.ts
index a284283d1c..07fd96eac8 100644
--- a/examples/sites/vite.config.ts
+++ b/examples/sites/vite.config.ts
@@ -69,9 +69,6 @@ export default defineConfig((config) => {
         targets: copyTarget
       })
     ],
-    define: {
-      'process.env': {}
-    },
     optimizeDeps: getOptimizeDeps(3),
     build: {
       rollupOptions: {
@@ -116,5 +113,11 @@ export default defineConfig((config) => {
     }
   }
 
+  if (env.NODE_ENV === 'development') {
+    viteConfig.define = {
+      'process.env': {}
+    }
+  }
+
   return viteConfig
 })