diff --git a/config/babel-preset-webpack.js b/config/babel-preset-webpack.js
index 48cfb87..dec3da5 100644
--- a/config/babel-preset-webpack.js
+++ b/config/babel-preset-webpack.js
@@ -2,37 +2,7 @@
 
 const browsers = require('./browsers');
 
-module.exports = function(env) {
-	const plugins = [
-		// class { handleClick = () => { } }
-		require.resolve('babel-plugin-transform-class-properties'),
-
-		// The following two plugins use Object.assign directly, instead of Babel's
-		// extends helper. Note that this assumes `Object.assign` is available.
-		// { ...todo, completed: true }
-		[require.resolve('babel-plugin-transform-object-rest-spread'), {
-			useBuiltIns: true,
-		}],
-
-		// Transforms JSX
-		[require.resolve('babel-plugin-transform-react-jsx'), {
-			useBuiltIns: true,
-			pragma: 'h',
-		}],
-	];
-
-	if (env === 'production') {
-		return {
-			presets: [
-				// Latest stable ECMAScript features
-				// Disable ES6 Modules transpilation since Webpack supports them natively
-				[require.resolve('babel-preset-latest'), {
-					modules: false,
-				}],
-			],
-			plugins,
-		};
-	}
+module.exports = function() {
 	return {
 		presets: [
 			// ES features necessary for user’s browsers
@@ -44,6 +14,22 @@ module.exports = function(env) {
 				modules: false,
 			}],
 		],
-		plugins,
+		plugins: [
+			// class { handleClick = () => { } }
+			require.resolve('babel-plugin-transform-class-properties'),
+
+			// The following two plugins use Object.assign directly, instead of Babel's
+			// extends helper. Note that this assumes `Object.assign` is available.
+			// { ...todo, completed: true }
+			[require.resolve('babel-plugin-transform-object-rest-spread'), {
+				useBuiltIns: true,
+			}],
+
+			// Transforms JSX
+			[require.resolve('babel-plugin-transform-react-jsx'), {
+				useBuiltIns: true,
+				pragma: 'h',
+			}],
+		],
 	};
 };
diff --git a/config/webpack.config.js b/config/webpack.config.js
index f2e10c8..26a584b 100644
--- a/config/webpack.config.js
+++ b/config/webpack.config.js
@@ -55,7 +55,7 @@ module.exports = function(scripts, env, options) {
 			ignoreOrder: true,
 		}),
 		new webpack.DefinePlugin({
-			'DEBUG': JSON.stringify(isDev),
+			DEBUG: JSON.stringify(isDev),
 			'process.env': {
 				NODE_ENV: JSON.stringify(env),
 			},