diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index 9227746eb23c4c..1ca05bd28651b2 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -718,7 +718,7 @@ async function restartServer(server: ViteDevServer) {
       // prevent new server `restart` function from calling
       // @ts-ignore
       newServer[key] = server[key]
-    } else if (key !== 'app') {
+    } else {
       // @ts-ignore
       server[key] = newServer[key]
     }