theme_private_upload_form issue with PHP 5.3

Hi,

I have the following warning when I edit a node, attach a file/s and then click save:

warning: Parameter 1 to theme_private_upload_form() expected to be a reference, value given in /www/includes/theme.inc on line 656 

So, I changed the function declaration theme_private_upload_form:

function theme_private_upload_form(&$form)

to that:

function theme_private_upload_form($form)

Is that issue solved in the last release?

I am using:
Drupal 6.16
MySQL 5.1.49
PHP 5.3.3-7
Apache/2.2.16 (Debian)

Thanks.