diff --git a/gulpfile.js b/gulpfile.js
index cd133716e..fef735230 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -19,7 +19,12 @@ const BUILD_TARGET_DIR = './dist/';
 
 gulp.task('build', function () {
   return gulp.src('lib/*.js')
-    .pipe(webpack(require('./support/webpack.config.js')))
+    .pipe(webpack({
+      config: [
+        require('./support/webpack.config.js'),
+        require('./support/webpack.config.slim.js')
+      ]
+    }))
     .pipe(minify({
       ext: {
         src: '.js',
diff --git a/package.json b/package.json
index 01a137d4f..c86fa152b 100644
--- a/package.json
+++ b/package.json
@@ -50,9 +50,10 @@
     "istanbul": "0.4.2",
     "mocha": "2.3.4",
     "socket.io": "1.6.0",
+    "strip-loader": "0.1.2",
     "text-blob-builder": "0.0.1",
     "uglify-js": "2.6.1",
-    "webpack-stream": "3.1.0",
+    "webpack-stream": "3.2.0",
     "zuul": "3.11.0",
     "zuul-builder-webpack": "1.1.0",
     "zuul-ngrok": "4.0.0"
diff --git a/support/noop.js b/support/noop.js
new file mode 100644
index 000000000..920c02ed2
--- /dev/null
+++ b/support/noop.js
@@ -0,0 +1,2 @@
+
+module.exports = function () { return function () {}; };
diff --git a/support/webpack.config.js b/support/webpack.config.js
index dbac096c2..c93314987 100644
--- a/support/webpack.config.js
+++ b/support/webpack.config.js
@@ -1,5 +1,6 @@
 
 module.exports = {
+  name: 'default',
   entry: './lib/index.js',
   output: {
     library: 'io',
diff --git a/support/webpack.config.slim.js b/support/webpack.config.slim.js
new file mode 100644
index 000000000..9fc6d7a54
--- /dev/null
+++ b/support/webpack.config.slim.js
@@ -0,0 +1,45 @@
+
+var webpack = require('webpack');
+
+module.exports = {
+  name: 'slim',
+  entry: './lib/index.js',
+  output: {
+    library: 'io',
+    libraryTarget: 'umd',
+    filename: 'socket.io.slim.js'
+  },
+  externals: {
+    global: glob()
+  },
+  devtool: 'cheap-module-source-map',
+  plugins: [
+    new webpack.NormalModuleReplacementPlugin(/(debug|json3)/, process.cwd() + '/support/noop.js')
+  ],
+  module: {
+    loaders: [{
+      test: /\.js$/,
+      exclude: /(node_modules|bower_components)/,
+      loader: 'babel', // 'babel-loader' is also a legal name to reference
+      query: { presets: ['es2015'] }
+    }, {
+      test: /\json3.js/,
+      loader: 'imports?define=>false'
+    }, {
+      test: /\.js$/,
+      loader: 'strip-loader?strip[]=debug'
+    }]
+  }
+};
+
+/**
+ * Populates `global`.
+ *
+ * @api private
+ */
+
+function glob () {
+  return 'typeof self !== "undefined" ? self : ' +
+    'typeof window !== "undefined" ? window : ' +
+    'typeof global !== "undefined" ? global : {}';
+}