Seems when I do that I just get a blank page.
Here is how my index.php file looks now:
<?php
/**
* Front to the WordPress application. This file doesn't do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/
/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define('WP_USE_THEMES', true);
/** Loads the WordPress Environment and Template */
require('wordpress/wp-blog-header.php');
?>
My install exists in a wordpress directory, as you mentioned, but when I use your suggested code I just a blank page.