diff --git a/lib/events.js b/lib/events.js
index a5cf6d4880b..9c2ba5442af 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -37,6 +37,9 @@ function EventEmitter() {
 }
 exports.EventEmitter = EventEmitter;
 
+EventEmitter.prototype.domain = undefined;
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._maxListeners = undefined;
 
 // By default EventEmitters will print a warning if more than 10 listeners are
 // added to it. This is a useful default which helps finding memory leaks.