diff --git a/lib/socket.js b/lib/socket.js
index 8aa768583e..8acc9754d1 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -76,8 +76,9 @@ Socket.prototype.__proto__ = Emitter.prototype;
  */
 
 exports.flags.forEach(function(flag){
-  Socket.prototype.__defineGetter__(flag, function(name){
-    this.flags.push(name);
+  Socket.prototype.__defineGetter__(flag, function(){
+    this.flags = this.flags || {};
+    this.flags[flag] = true;
     return this;
   });
 });