Separate installs of WordPress and Phpbb

I have a website with separate installs of WordPress and Phpbb.

WordPress is installed in the root directory, Phpbb is installed in the forum directory.

I *do not* want to integrate the two.

The problem is when I try to access domainname.com/forum – I get a 404 error message. WordPress seems to take over everything. (The forum itself installed fine. No problems there. WordPress works fine too.)

WordPress htaccess code:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

I tried this for the forum, put it in the root htaccess file as well as the forum root, but no luck.

#forum

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /forum/
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /forum/index\.php\ HTTP/
RewriteRule ^index\.php$ http://domainname.com/forum/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /forum/index.php [L]
</IfModule>

#End forum

Does anyone have any ideas of what I can try in my htaccess file? Everything I’ve searched for on Google or this site talks about integrating WP and Phpbb and is no help.

Thank you.