diff --git a/doc/api/fs.md b/doc/api/fs.md
index 091c93736a27ea..134e0cf6dfb575 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -1468,7 +1468,7 @@ access('myfile', (err) => {
 
 **read (RECOMMENDED)**
 
-```js
+```mjs
 import { open, close } from 'fs';
 
 open('myfile', 'r', (err, fd) => {