http: .once() usage in setTimeout

lib/http.js

@@ -1494,13 +1494,13 @@ ClientRequest.prototype.setTimeout = function(msecs, callback) {
   }
 
   if (this.socket) {
-    this.socket.on('connect', function() {
+    this.socket.once('connect', function() {
       this.setTimeout(msecs, emitTimeout);
     });
     return;
   }
 
-  this.on('socket', function(sock) {
+  this.once('socket', function(sock) {
     this.setTimeout(msecs, emitTimeout);
   });
 };