diff --git a/test/parallel/test-cluster-disconnect-idle-worker.js b/test/parallel/test-cluster-disconnect-idle-worker.js
index abb8f67100..e3ad91ad10 100644
--- a/test/parallel/test-cluster-disconnect-idle-worker.js
+++ b/test/parallel/test-cluster-disconnect-idle-worker.js
@@ -1,13 +1,13 @@
 'use strict';
-var common = require('../common');
-var assert = require('assert');
-var cluster = require('cluster');
-var fork = cluster.fork;
+const common = require('../common');
+const assert = require('assert');
+const cluster = require('cluster');
+const fork = cluster.fork;
 
 if (cluster.isMaster) {
   fork(); // it is intentionally called `fork` instead of
   fork(); // `cluster.fork` to test that `this` is not used
-  cluster.disconnect(common.mustCall(function() {
+  cluster.disconnect(common.mustCall(() => {
     assert.deepStrictEqual(Object.keys(cluster.workers), []);
   }));
 }