diff --git a/lib/websocket-tracker.js b/lib/websocket-tracker.js
index c31af91..b784888 100644
--- a/lib/websocket-tracker.js
+++ b/lib/websocket-tracker.js
@@ -161,8 +161,9 @@ WebSocketTracker.prototype._onSocketData = function (data) {
 
 WebSocketTracker.prototype._send = function (params) {
   var self = this
-  debug('send %s', JSON.stringify(params))
-  self._socket.send(params)
+  var message = JSON.stringify(params)
+  debug('send %s', message)
+  self._socket.send(message)
 }
 
 WebSocketTracker.prototype._generateOffers = function (numWant, cb) {