diff --git a/playground/backend-integration/vite.config.js b/playground/backend-integration/vite.config.js
index f0df64975f65e6..d4714288cb0e68 100644
--- a/playground/backend-integration/vite.config.js
+++ b/playground/backend-integration/vite.config.js
@@ -28,6 +28,9 @@ function BackendIntegrationExample() {
           strictPort: true,
           origin: 'http://localhost:5009',
         },
+        preview: {
+          port: 5009,
+        },
         build: {
           manifest: true,
           outDir,