Event Registration Confirmation email broken link

When I enter my name Mary Lou in the registration form, the payment link in the confirmation email is broken because of the space in my name.
(ie- Click here to review your payment information http://abccopyright2016.com/index.php/event-payment/?id=5&fname=Mary Lou). The “Lou” is left out of the link.
Any ideas on how I can fix this?

Thanks,
ML