diff --git a/src/core/EventDispatcher.js b/src/core/EventDispatcher.js
index 2b9b4649a6de029820d598a547f7ee617cc7f42f..417a730bbcadaa92241f95aef9e0bd4313da3801 100644
--- a/src/core/EventDispatcher.js
+++ b/src/core/EventDispatcher.js
@@ -4,7 +4,7 @@
 
 function EventDispatcher() {}
 
-EventDispatcher.prototype = {
+Object.assign( EventDispatcher.prototype, {
 
 	addEventListener: function ( type, listener ) {
 
@@ -87,7 +87,7 @@ EventDispatcher.prototype = {
 
 	}
 
-};
+} );
 
 
 export { EventDispatcher };