diff --git a/README.md b/README.md
index 91a100c..1ddc7d6 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ fastify.get('/user/:id', (req, reply) => {
   }
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -74,7 +74,7 @@ fastify.get('/user/:id', async (req, reply) => {
   }
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -96,7 +96,7 @@ fastify.get('/user/:id', (req, reply) => {
   )
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -144,7 +144,7 @@ fastify.pg.transact((client, commit) => {
 
 */
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -173,7 +173,7 @@ fastify.get('/user/:id', (req, reply) => {
   )
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -201,7 +201,7 @@ fastify.get('/user/:id', (req, reply) => {
   )
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })
@@ -229,7 +229,7 @@ fastify.get('/user/:id', (req, reply) => {
   )
 })
 
-fastify.listen(3000, err => {
+fastify.listen({ port: 3000 }, err => {
   if (err) throw err
   console.log(`server listening on ${fastify.server.address().port}`)
 })