diff --git a/lib/index.js b/lib/index.js
index 6b9b153b..0882d4be 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -100,7 +100,11 @@ Server.prototype.attach = function(srv, opts){
     srv.listen(port);
   }
 
-  debug('creating engine.io instance', opts);
+  // set engine.io path to `/socket.io`
+  opts = opts || {};
+  opts.path = opts.path || '/socket.io';
+
+  debug('creating engine.io instance with opts %j', opts);
   if (this._static) this.serve(srv);
   srv = engine.attach(srv, opts);
   this.bind(srv);