diff --git a/lib/NewWatchingPlugin.js b/lib/NewWatchingPlugin.js
index <HASH>..<HASH> 100644
--- a/lib/NewWatchingPlugin.js
+++ b/lib/NewWatchingPlugin.js
@@ -2,11 +2,14 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
-function NewWatchingPlugin() {}
-module.exports = NewWatchingPlugin;
+'use strict';
+
+class NewWatchingPlugin {
+	apply(compiler) {
+		compiler.plugin("compilation", function(compilation) {
+			compilation.warnings.push(new Error("The 'NewWatchingPlugin' is no longer necessary (now default)"));
+		});
+	}
+}
 
-NewWatchingPlugin.prototype.apply = function(compiler) {
-	compiler.plugin("compilation", function(compilation) {
-		compilation.warnings.push(new Error("The 'NewWatchingPlugin' is no longer necessary (now default)"));
-	});
-};
+module.exports = NewWatchingPlugin;
refactor(es6): Upgrade NewWatchingPlugin to es6 (#<I>)