you shouldn't need to, as its a php file the server would parse it, and i'm guessing all this include does is set some variables and maybe establish a connect to a database. so if they tried to get at it, they would only get anything that the script outputted using echo's or prints . so if all the file contains is
$dbuser = username;
$dbpassword = password;
$dbhost = my.db.host;
they would just get a blank screen as there are no output commands in there (this is the reason why using a file with a php extension is better that using a .inc file as a lot of people do).
cheers
Jamie