mocha: Browserify cannot find runnable module when using require('mocha')

When compiling test scripts into a single monolith using Browserify, I hit the error:

module "./runnable" not found from "../node_modules/mocha/mocha.js".

Line 846 of mocha.js requires runnable as such:

var Runnable = require('./runnable');

Does this need to be amended as such?

var Runnable = require('./lib/runnable');

If this is true, it seems there are several file paths that need to be renamed. Is there a workaround?