Make referral link same for Mapped Domain

Hi there,

Just want to ask if is there a way to make the referral links for affiliates be the same for mapped domains? For example, our subdomain site Nathalieguignet.bonheurenvrac.com gives this link for referrals: http://i.imgur.com/h9DnFl3.jpg

We mapped this subdomain to the adieusymptomes.com domain. Is there a way to make the referral URL start with the mapped domain: http://adieusymptomes.com?Ref=Bonheur-Admin-63