diff --git a/test/lib-http-proxy-test.js b/test/lib-http-proxy-test.js
index cc772b8..83e8c5d 100644
--- a/test/lib-http-proxy-test.js
+++ b/test/lib-http-proxy-test.js
@@ -5,6 +5,17 @@ var httpProxy = require('../lib/http-proxy'),
     io        = require('socket.io'),
     ioClient  = require('socket.io-client');
 
+//
+// Expose a port number generator.
+// thanks to @3rd-Eden
+//
+var initialPort = 1024, gen = {};
+Object.defineProperty(gen, 'port', {
+  get: function get() {
+    return initialPort++;
+  }
+});
+
 
 describe('lib/http-proxy.js', function() {
   describe('#createProxyServer', function() {
@@ -32,44 +43,45 @@ describe('lib/http-proxy.js', function() {
 
   describe('#createProxyServer with forward options and using web-incoming passes', function () {
     it('should pipe the request using web-incoming#stream method', function (done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        forward: 'http://127.0.0.1:8080'
-      }).listen('8081')
+        forward: 'http://127.0.0.1:' + ports.source
+      }).listen(ports.proxy);
 
       var source = http.createServer(function(req, res) {
         expect(req.method).to.eql('GET');
-        expect(req.headers.host.split(':')[1]).to.eql('8081');
+        expect(req.headers.host.split(':')[1]).to.eql(ports.proxy);
         source.close();
         proxy._server.close();
         done();
       });
 
-      source.listen('8080');
-      
-      http.request('http://127.0.0.1:8081', function() {}).end();
+      source.listen(ports.source);
+      http.request('http://127.0.0.1:' + ports.proxy, function() {}).end();
     })
   });
 
   describe('#createProxyServer using the web-incoming passes', function () {
     it('should make the request on pipe and finish it', function(done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'http://127.0.0.1:8080'
-      }).listen('8081');
+        target: 'http://127.0.0.1:' + ports.source
+      }).listen(ports.proxy);
 
       var source = http.createServer(function(req, res) {
         expect(req.method).to.eql('POST');
         expect(req.headers['x-forwarded-for']).to.eql('127.0.0.1');
-        expect(req.headers.host.split(':')[1]).to.eql('8081');
+        expect(req.headers.host.split(':')[1]).to.eql(ports.proxy);
         source.close();
         proxy._server.close();
         done();
       });
 
-      source.listen('8080');
+      source.listen(ports.source);
       
       http.request({
         hostname: '127.0.0.1',
-        port: '8081',
+        port: ports.proxy,
         method: 'POST',
         headers: {
           'x-forwarded-for': '127.0.0.1'
@@ -80,28 +92,29 @@ describe('lib/http-proxy.js', function() {
 
   describe('#createProxyServer using the web-incoming passes', function () {
     it('should make the request, handle response and finish it', function(done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'http://127.0.0.1:8080'
-      }).listen('8081');
+        target: 'http://127.0.0.1:' + ports.source
+      }).listen(ports.proxy);
 
       var source = http.createServer(function(req, res) {
         expect(req.method).to.eql('GET');
-        expect(req.headers.host.split(':')[1]).to.eql('8081');
+        expect(req.headers.host.split(':')[1]).to.eql(ports.proxy);
         res.writeHead(200, {'Content-Type': 'text/plain'})
         res.end('Hello from ' + source.address().port);
       });
 
-      source.listen('8080');
+      source.listen(ports.source);
       
       http.request({
         hostname: '127.0.0.1',
-        port: '8081',
-        method: 'GET',
+        port: ports.proxy,
+        method: 'GET'
       }, function(res) {
         expect(res.statusCode).to.eql(200);
 
         res.on('data', function (data) {
-          expect(data.toString()).to.eql('Hello from 8080');
+          expect(data.toString()).to.eql('Hello from ' + ports.source);
         });
 
         res.on('end', function () { 
@@ -115,8 +128,9 @@ describe('lib/http-proxy.js', function() {
 
   describe('#createProxyServer() method with error response', function () {
     it('should make the request and emit the error event', function(done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'http://127.0.0.1:8080'
+        target: 'http://127.0.0.1:' + ports.source
       });
 
       proxy.on('error', function (err) {
@@ -126,11 +140,11 @@ describe('lib/http-proxy.js', function() {
         done();
       })
 
-      proxy.listen('8081');
+      proxy.listen(ports.proxy);
       
       http.request({
         hostname: '127.0.0.1',
-        port: '8081',
+        port: ports.proxy,
         method: 'GET',
       }, function() {}).end();
     });
@@ -139,10 +153,11 @@ describe('lib/http-proxy.js', function() {
   describe('#createProxyServer setting the correct timeout value', function () {
     it('should hang up the socket at the timeout', function (done) {
       this.timeout(30);
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'http://127.0.0.1:8080',
+        target: 'http://127.0.0.1:' + ports.source,
         timeout: 3
-      }).listen('8081');
+      }).listen(ports.proxy);
 
       var source = http.createServer(function(req, res) {
         setTimeout(function () {
@@ -150,11 +165,11 @@ describe('lib/http-proxy.js', function() {
         }, 5)
       });
 
-      source.listen('8080');
+      source.listen(ports.source);
 
       var testReq = http.request({
         hostname: '127.0.0.1',
-        port: '8081',
+        port: ports.proxy,
         method: 'GET',
       }, function() {});
 
@@ -217,13 +232,14 @@ describe('lib/http-proxy.js', function() {
 
   describe('#createProxyServer using the ws-incoming passes', function () {
     it('should proxy the websockets stream', function (done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'ws://127.0.0.1:8080',
+        target: 'ws://127.0.0.1:' + ports.source,
         ws: true
       }),
-      proxyServer = proxy.listen('8081'),
-      destiny = new ws.Server({ port: 8080 }, function () {
-        var client = new ws('ws://127.0.0.1:8081');
+      proxyServer = proxy.listen(ports.proxy),
+      destiny = new ws.Server({ port: ports.source }, function () {
+        var client = new ws('ws://127.0.0.1:' + ports.proxy);
 
         client.on('open', function () {
           client.send('hello there');
@@ -249,13 +265,14 @@ describe('lib/http-proxy.js', function() {
 
   describe('#createProxyServer using the ws-incoming passes', function () {
     it('should proxy a socket.io stream', function (done) {
+      var ports = { source: gen.port, proxy: gen.port };
       var proxy = httpProxy.createProxyServer({
-        target: 'ws://127.0.0.1:8080',
+        target: 'ws://127.0.0.1:' + ports.source,
         ws: true
       }),
-      proxyServer = proxy.listen('8081'),
-      destiny = io.listen(8080, function () {
-        var client = ioClient.connect('ws://127.0.0.1:8081');
+      proxyServer = proxy.listen(ports.proxy),
+      destiny = io.listen(ports.source, function () {
+        var client = ioClient.connect('ws://127.0.0.1:' + ports.proxy);
 
         client.on('connect', function () {
           client.emit('incoming', 'hello there');