diff --git a/packages/nitro/src/runtime/app/nitro.client.js b/packages/nitro/src/runtime/app/nitro.client.mjs
similarity index 100%
rename from packages/nitro/src/runtime/app/nitro.client.js
rename to packages/nitro/src/runtime/app/nitro.client.mjs
diff --git a/packages/nuxt3/src/nitro.ts b/packages/nuxt3/src/nitro.ts
index cdb98ba4a9..a93c9ba0c8 100644
--- a/packages/nuxt3/src/nitro.ts
+++ b/packages/nuxt3/src/nitro.ts
@@ -22,7 +22,7 @@ export function initNitro (nuxt: Nuxt) {
 
   // Add nitro client plugin (to inject $fetch helper)
   nuxt.hook('app:resolve', (app) => {
-    app.plugins.push({ src: '@nuxt/nitro/dist/runtime/app/nitro.client' })
+    app.plugins.push({ src: require.resolve('@nuxt/nitro/dist/runtime/app/nitro.client.mjs') })
   })
 
   // Expose process.env.NITRO_PRESET