diff --git a/lib/index.js b/lib/index.js
index f58bdad..46d4d66 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -137,7 +137,7 @@ function authorize(options, onConnection) {
 
   return function(socket, accept){
     var token, error;
-    var handshake = data.handshake;
+    var handshake = socket.handshake;
     var req = socket.request || socket;
     var authorization_header = (req.headers || {}).authorization;