diff --git a/docs/advanced-features/custom-server.md b/docs/advanced-features/custom-server.md
index 89ce91bfb235e..9a2b05d950264 100644
--- a/docs/advanced-features/custom-server.md
+++ b/docs/advanced-features/custom-server.md
@@ -53,10 +53,14 @@ app.prepare().then(() => {
       res.statusCode = 500
       res.end('internal server error')
     }
-  }).listen(port, (err) => {
-    if (err) throw err
-    console.log(`> Ready on http://${hostname}:${port}`)
   })
+    .once('error', (err) => {
+      console.error(err)
+      process.exit(1)
+    })
+    .listen(port, () => {
+      console.log(`> Ready on http://${hostname}:${port}`)
+    })
 })
 ```