anchor tags appear on permissions fieldsets as text

On the permissions page in FF 3.5 (didn't check anything else) the titles of the collapsible fieldsets for modules appear with the <a tags as text. Can be fixed by replacing the fieldset definition at line 126 with:

        $fieldset_form[$fieldset_module_watcher] = array(
          '#type' => 'fieldset',
          '#title' => t('@module module', array('@module' => $fieldset_module_watcher)),
          '#collapsible' => TRUE,
          '#collapsed' => $collapsed,
          '#weight' => ++$fieldset_weight,
	  '#prefix' => '<a name="module-' . $fieldset_module_watcher . '">',
	  '#suffix' => '</a>'
          );

Cheers

Alex