diff --git a/playground/optimize-missing-deps/server.js b/playground/optimize-missing-deps/server.js
index 411c3342b02d9c..ea50b9adc291e5 100644
--- a/playground/optimize-missing-deps/server.js
+++ b/playground/optimize-missing-deps/server.js
@@ -1,8 +1,10 @@
 // @ts-check
 import fs from 'node:fs'
 import path from 'node:path'
+import { fileURLToPath } from 'node:url'
 import express from 'express'
 
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
 const isTest = process.env.VITEST
 
 export async function createServer(root = process.cwd(), hmrPort) {