firefly-iii/app/Providers/BusServiceProvider.php

<?php namespace FireflyIII\Providers;

use Illuminate\Bus\Dispatcher;
use Illuminate\Support\ServiceProvider;

/**
 * Class BusServiceProvider
 *
 * @package FireflyIII\Providers
 */
class BusServiceProvider extends ServiceProvider
{

    /**
     * Bootstrap any application services.
     *
     * @param  \Illuminate\Bus\Dispatcher $dispatcher
     *
     * @return void
     */
    public function boot(Dispatcher $dispatcher)
    {
        $dispatcher->mapUsing(
            function ($command) {
                return Dispatcher::simpleMapping(
                    $command, 'FireflyIII\Commands', 'FireflyIII\Handlers\Commands'
                );
            }
        );
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

}