diff --git a/coretool.js b/coretool.js
index 10c65ff..9bfee90 100644
--- a/coretool.js
+++ b/coretool.js
@@ -15,6 +15,7 @@ module.exports = {
   BASEPORT_WEB_SERVER: 8000,
   BASEPORT_CHAIN_SERVER: 6000,
   BASEPORT_NET_NODE: 60000,
+  PORT_WEB_SERVER_DEV: 8338, // 338 stands for dev
 
   sleep: (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms)),