diff --git a/test/parallel/test-cluster-disconnect-leak.js b/test/parallel/test-cluster-disconnect-leak.js
index a4916c95ba..45539367ab 100644
--- a/test/parallel/test-cluster-disconnect-leak.js
+++ b/test/parallel/test-cluster-disconnect-leak.js
@@ -26,4 +26,4 @@ if (cluster.isMaster) {
 
 const server = net.createServer();
 
-server.listen(common.PORT);
+server.listen(0);
diff --git a/test/parallel/test-cluster-disconnect-race.js b/test/parallel/test-cluster-disconnect-race.js
index 09966cbab8..7bb66ced36 100644
--- a/test/parallel/test-cluster-disconnect-race.js
+++ b/test/parallel/test-cluster-disconnect-race.js
@@ -34,6 +34,6 @@ if (cluster.isMaster) {
 
 const server = net.createServer();
 
-server.listen(common.PORT, function() {
+server.listen(0, function() {
   process.send('listening');
 });
diff --git a/test/parallel/test-cluster-process-disconnect.js b/test/parallel/test-cluster-process-disconnect.js
index f83dd00949..2174d118c3 100644
--- a/test/parallel/test-cluster-process-disconnect.js
+++ b/test/parallel/test-cluster-process-disconnect.js
@@ -12,7 +12,7 @@ if (cluster.isMaster) {
 } else {
   const net = require('net');
   const server = net.createServer();
-  server.listen(common.PORT, common.mustCall(() => {
+  server.listen(0, common.mustCall(() => {
     process.disconnect();
   }));
 }