--- a/testing/marionette/components/marionette.js
+++ b/testing/marionette/components/marionette.js
@@ -17,17 +17,16 @@ XPCOMUtils.defineLazyServiceGetter(
 const MARIONETTE_CONTRACT_ID = "@mozilla.org/marionette;1";
 const MARIONETTE_CID = Components.ID("{786a1369-dca5-4adc-8486-33d23c88010a}");
 
 const PREF_PORT = "marionette.port";
 const PREF_PORT_FALLBACK = "marionette.defaultPrefs.port";
 const PREF_LOG_LEVEL = "marionette.log.level";
 const PREF_LOG_LEVEL_FALLBACK = "marionette.logging";
 
-const DEFAULT_PORT = 2828;
 const DEFAULT_LOG_LEVEL = "info";
 const LOG_LEVELS = new class extends Map {
   constructor () {
     super([
       ["fatal", Log.Level.Fatal],
       ["error", Log.Level.Error],
       ["warn", Log.Level.Warn],
       ["info", Log.Level.Info],