diff --git a/lib/DllPlugin.js b/lib/DllPlugin.js
index cab2173ae..33fabb18c 100644
--- a/lib/DllPlugin.js
+++ b/lib/DllPlugin.js
@@ -1,32 +1,38 @@
 /*
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
-*/
-var DllEntryPlugin = require("./DllEntryPlugin");
-var LibManifestPlugin = require("./LibManifestPlugin");
-var FlagInitialModulesAsUsedPlugin = require("./FlagInitialModulesAsUsedPlugin");
+	*/
+"use strict";
 
-function DllPlugin(options) {
-	this.options = options;
+const DllEntryPlugin = require("./DllEntryPlugin");
+const LibManifestPlugin = require("./LibManifestPlugin");
+const FlagInitialModulesAsUsedPlugin = require("./FlagInitialModulesAsUsedPlugin");
+
+class DllPlugin {
+	constructor(options) {
+		this.options = options;
+	}
+
+	apply(compiler) {
+		compiler.plugin("entry-option", (context, entry) => {
+			function itemToPlugin(item, name) {
+				if(Array.isArray(item))
+					return new DllEntryPlugin(context, item, name);
+				else
+					throw new Error("DllPlugin: supply an Array as entry");
+			}
+			if(typeof entry === "object" && !Array.isArray(entry)) {
+				Object.keys(entry).forEach(name => {
+					compiler.apply(itemToPlugin(entry[name], name));
+				});
+			} else {
+				compiler.apply(itemToPlugin(entry, "main"));
+			}
+			return true;
+		});
+		compiler.apply(new LibManifestPlugin(this.options));
+		compiler.apply(new FlagInitialModulesAsUsedPlugin());
+	}
 }
+
 module.exports = DllPlugin;
-DllPlugin.prototype.apply = function(compiler) {
-	compiler.plugin("entry-option", function(context, entry) {
-		function itemToPlugin(item, name) {
-			if(Array.isArray(item))
-				return new DllEntryPlugin(context, item, name);
-			else
-				throw new Error("DllPlugin: supply an Array as entry");
-		}
-		if(typeof entry === "object" && !Array.isArray(entry)) {
-			Object.keys(entry).forEach(function(name) {
-				compiler.apply(itemToPlugin(entry[name], name));
-			});
-		} else {
-			compiler.apply(itemToPlugin(entry, "main"));
-		}
-		return true;
-	});
-	compiler.apply(new LibManifestPlugin(this.options));
-	compiler.apply(new FlagInitialModulesAsUsedPlugin());
-};