Financing the down payment for the buyer

I know there are risks to financing the 10% down payment for the buyer, but just curious if any of you have had any luck doing this. We have an $80,000 rental that tenant wants to buy and we have about $35,000 in equity so considering financing the $8,000 down payment. Does this make any sense? Buyer has good credit and qualified for loan, but doesn't have the cash saved up for the downpayment.