diff --git a/lib/_debug_agent.js b/lib/_debug_agent.js
index c731ca374b5e87..a820b21615a2d7 100644
--- a/lib/_debug_agent.js
+++ b/lib/_debug_agent.js
@@ -107,7 +107,7 @@ function Client(agent, socket) {
 }
 util.inherits(Client, Transform);
 
-Client.prototype.destroy = function destroy(msg) {
+Client.prototype.destroy = function destroy() {
   this.socket.destroy();
 
   this.emit('close');