Jaredhoyt cakephp-wizard

I have a wizard of 5 steps:

function beforeFilter() {
$this->Wizard->steps = array('user', 'profile', 'term', 'payment', 'confirm'); $this->Wizard->completeUrl = "/users/complete"; $this->Wizard->wizardAction = "join"; }

The final step, confirm, has this process hook:
function _processConfirm() {
debug("made it to process for confirm");
return true;
}

Which runs as expected. However, following that code running, Wizard attempts a redirect to /users/join. I expect it to redirect to /users/complete. Having added that debug() to _processConfirm, CakePHP started throwing an error:

Warning (2): Cannot modify header information - headers already sent by ....

Viewing the stack trace, it unwinds to
WizardComponent::process() - APP/plugins/wizard/controllers/components/wizard.php, line 245

if ($proceed) {
$this->save(); if (next($this->steps)) {

if ($this->autoAdvance) {
  $this->redirect();
}
$this->redirect(current($this->steps));

} else {

$this->Session->write('Wizard.complete', $this->read());
$this->reset();

$this->controller->redirect($this->wizardAction); // Line 245

} }

I assume that line should read
$this->controller->redirect($this->completeUrl);