diff --git a/lib/server.js b/lib/server.js
index 2853582..b866ff8 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -651,8 +651,8 @@ Server.prototype.after = function () {
 
 // All these just reexpose the requisite net.Server APIs
 Server.prototype.listen = function (port, host, callback) {
-  if (typeof port !== 'number')
-    throw new TypeError('port (number) required');
+  if (typeof (port) !== 'number' && typeof (port) !== 'string')
+    throw new TypeError('port (number or path) required');
 
   if (typeof (host) === 'function') {
     callback = host;