diff --git a/test/parallel/test-cluster-send-deadlock.js b/test/parallel/test-cluster-send-deadlock.js
index bd6b6c90338e16..9ae0f4a1192ac7 100644
--- a/test/parallel/test-cluster-send-deadlock.js
+++ b/test/parallel/test-cluster-send-deadlock.js
@@ -23,7 +23,7 @@
 // Testing mutual send of handles: from master to worker, and from worker to
 // master.
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const cluster = require('cluster');
 const net = require('net');
@@ -40,14 +40,15 @@ if (cluster.isMaster) {
     worker.send('handle', socket);
   });
 
-  server.listen(common.PORT, function() {
-    worker.send('listen');
+  server.listen(0, function() {
+    worker.send({message: 'listen', port: server.address().port});
   });
 } else {
   process.on('message', function(msg, handle) {
-    if (msg === 'listen') {
-      const client1 = net.connect({ host: 'localhost', port: common.PORT });
-      const client2 = net.connect({ host: 'localhost', port: common.PORT });
+    if (msg.message && msg.message === 'listen') {
+      assert(msg.port);
+      const client1 = net.connect({ host: 'localhost', port: msg.port });
+      const client2 = net.connect({ host: 'localhost', port: msg.port });
       let waiting = 2;
       client1.on('close', onclose);
       client2.on('close', onclose);
diff --git a/test/parallel/test-cluster-send-handle-twice.js b/test/parallel/test-cluster-send-handle-twice.js
index c3a00766fddf49..0d725733faa955 100644
--- a/test/parallel/test-cluster-send-handle-twice.js
+++ b/test/parallel/test-cluster-send-handle-twice.js
@@ -45,8 +45,11 @@ if (cluster.isMaster) {
     process.send('send-handle-2', socket);
   });
 
-  server.listen(common.PORT, function() {
-    const client = net.connect({ host: 'localhost', port: common.PORT });
+  server.listen(0, function() {
+    const client = net.connect({
+      host: 'localhost',
+      port: server.address().port
+    });
     client.on('close', common.mustCall(() => { cluster.worker.disconnect(); }));
     setTimeout(function() { client.end(); }, 50);
   }).on('error', function(e) {