htaccess redirects from index.php?var=

My old site was a php site that pull directly from the database and there is a few pages that were

http://www.domain.com/index.php?q=page_name

Now I have added this to .htaccess file in hopes to redirect any one to the correct page

Redirect 301 /index.php?q=page_name http://www.domain.com/page_name/

However it redirects back to the home page with the following in the url.

http://www.domain.com/?q=page_name

Is it possible to redirect this or is something with wordpress messing this up?

Thanks!