diff --git a/lib/commands/start.js b/lib/commands/start.js
index 9550eab7c1..5b7a96e831 100644
--- a/lib/commands/start.js
+++ b/lib/commands/start.js
@@ -50,6 +50,7 @@ module.exports = async function start(siteDir, cliOptions = {}) {
   }
 
   const port = await getPort(cliOptions.port);
+  const hotPort = await getPort(port + 1);
   const {baseUrl} = props;
 
   // create compiler from generated webpack config
@@ -79,7 +80,7 @@ module.exports = async function start(siteDir, cliOptions = {}) {
           logLevel: 'silent'
         },
         hotClient: {
-          port: port + 1,
+          port: hotPort,
           logLevel: 'error'
         },
         logLevel: 'error',