diff --git a/src/constants.js b/src/constants.js
index 6453497b3..9fa78a7a7 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -28,7 +28,6 @@ exports = module.exports = {
     INTERNAL_SMTP_PORT: 2525, // this value comes from the mail container
     AUTHWALL_PORT: 3001,
     LDAP_PORT: 3002,
-    DNS_PORT: 533,
     DOCKER_PROXY_PORT: 3003,
 
     NGINX_DEFAULT_CONFIG_FILE_NAME: 'default.conf',