diff --git a/packages/vite/src/client.ts b/packages/vite/src/client.ts
index 2cb3f03ebbf..cd96a17d9a8 100644
--- a/packages/vite/src/client.ts
+++ b/packages/vite/src/client.ts
@@ -48,6 +48,7 @@ export async function buildClient (ctx: ViteBuildContext) {
       }),
       viteNodePlugin(ctx)
     ],
+    appType: 'custom',
     server: {
       middlewareMode: true
     }