diff --git a/package.json b/package.json
index c06608c86..058c1e78d 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "eslint": "^4.0.0",
     "jsdoc-strip-async-await": "^0.1.0",
     "parallel-webpack": "^2.0.0",
-    "uglifyjs-webpack-plugin": "^1.0.0-beta.1",
+    "uglifyjs-webpack-plugin": "^1.0.0-beta.2",
     "webpack": "^3.0.0"
   },
   "engines": {
diff --git a/test/webpack.html b/test/webpack.html
index 19c1b803e..3bc9482fe 100644
--- a/test/webpack.html
+++ b/test/webpack.html
@@ -5,7 +5,7 @@
   <meta charset="utf-8" />
 </head>
 <body>
-  <script type="text/javascript" src="../webpack/discord.js"></script>
+  <script type="text/javascript" src="../webpack/discord.12.0.0-dev.min.js"></script>
   <script type="text/javascript" src="auth.js"></script>
   <script type="text/javascript">
     (() => {
diff --git a/webpack.config.js b/webpack.config.js
index db75a5e23..5dc53a8cb 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -19,7 +19,14 @@ const createConfig = options => {
     }),
   ];
 
-  if (options.minify) plugins.push(new UglifyJSPlugin({ uglifyOptions: { output: { comments: false } } }));
+  if (options.minify) {
+    plugins.push(new UglifyJSPlugin({
+      uglifyOptions: {
+        mangle: { keep_classnames: true },
+        output: { comments: false },
+      },
+    }));
+  }
 
   const filename = `./webpack/discord${process.env.VERSIONED === 'false' ? '' : '.' + version}${options.minify ? '.min' : ''}.js`; // eslint-disable-line
 
