How to disable hot module replacement in webpack for production

How does one remove all references of HMR when bundling for production?

My production Webpack config has no references to HMR and yet in the browser debugger the client is constantly making a xhr call to /__webpack_hmr

Can anyone shed a light on this?

-- my config

var path = require('path');
var webpack = require('webpack');

module.exports = {
entry: [
      path.resolve(__dirname, 'master/jsx/App')
    ],
    output: {
        path: path.resolve(__dirname, 'build'),
        publicPath: '/dist/',
        filename: 'app.bundle.js'
    },
    cache: false,
    devtool: 'sourcemap',
    resolve: {
        extensions: ['', '.js', '.jsx']
    },
    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': '"production"'
        }),
        new webpack.optimize.UglifyJsPlugin({
            compressor: {
                warnings: false
            }
        })
    ],
    module: {
        loaders: [{
            test: /\.jsx?$/,
            exclude: /node_modules/
        }, {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel',
            query: {
                presets: ['es2015', 'react'],
                compact: false
            }
        }, {
            test: /\.css$/,
            loader: "style-loader!css-loader"
        }, {
            test: /\.woff|\.woff2|\.svg|.eot|\.ttf/,
            loader: 'url?prefix=font/&limit=10000'
        }]
    }
};