All links point to Twitter

I'm using the Twitter module to display my Identi.ca postings on my website, however all the link to other people's accounts (i.e. @username) point to Twitter instead of Identi.ca.
I'm thinking it's this piece of code on line 114 in 'twitter.pages.inc':

$form['visible_name'] = array(
  '#type' => 'markup',
  '#value' => l($account['screen_name'], 'http://www.twitter.com/' . $account['screen_name']),
);

though I don't know what to change it to...