diff --git a/lib/index.js b/lib/index.js
index 7d67ce92..9e07c304 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -159,7 +159,9 @@ Server.prototype.adapter = function(v){
   if (!arguments.length) return this._adapter;
   this._adapter = v;
   for (var i in this.nsps) {
-    this.nsps[i].initAdapter();
+    if (this.nsps[i].hasOwnProperty(i)) {
+      this.nsps[i].initAdapter();
+    }
   }
   return this;
 };