diff --git a/lib/EvalSourceMapDevToolPlugin.js b/lib/EvalSourceMapDevToolPlugin.js
index 63f145394..04c36eb86 100644
--- a/lib/EvalSourceMapDevToolPlugin.js
+++ b/lib/EvalSourceMapDevToolPlugin.js
@@ -2,25 +2,31 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
-var EvalSourceMapDevToolModuleTemplatePlugin = require("./EvalSourceMapDevToolModuleTemplatePlugin");
-var SourceMapDevToolModuleOptionsPlugin = require("./SourceMapDevToolModuleOptionsPlugin");
+"use strict";
 
-function EvalSourceMapDevToolPlugin(options) {
-	if(arguments.length > 1)
-		throw new Error("EvalSourceMapDevToolPlugin only takes one argument (pass an options object)");
-	if(typeof options === "string") {
-		options = {
-			append: options
-		};
+const EvalSourceMapDevToolModuleTemplatePlugin = require("./EvalSourceMapDevToolModuleTemplatePlugin");
+const SourceMapDevToolModuleOptionsPlugin = require("./SourceMapDevToolModuleOptionsPlugin");
+
+class EvalSourceMapDevToolPlugin {
+	constructor(options) {
+		if(arguments.length > 1)
+			throw new Error("EvalSourceMapDevToolPlugin only takes one argument (pass an options object)");
+		if(typeof options === "string") {
+			options = {
+				append: options
+			};
+		}
+		if(!options) options = {};
+		this.options = options;
+	}
+
+	apply(compiler) {
+		let options = this.options;
+		compiler.plugin("compilation", (compilation) => {
+			new SourceMapDevToolModuleOptionsPlugin(options).apply(compilation);
+			compilation.moduleTemplate.apply(new EvalSourceMapDevToolModuleTemplatePlugin(compilation, options));
+		});
 	}
-	if(!options) options = {};
-	this.options = options;
 }
+
 module.exports = EvalSourceMapDevToolPlugin;
-EvalSourceMapDevToolPlugin.prototype.apply = function(compiler) {
-	var options = this.options;
-	compiler.plugin("compilation", function(compilation) {
-		new SourceMapDevToolModuleOptionsPlugin(options).apply(compilation);
-		compilation.moduleTemplate.apply(new EvalSourceMapDevToolModuleTemplatePlugin(compilation, options));
-	});
-};