Paid some of rent on 1099-MISC to buyer of rental house

I sold my rental house (with the tenant still in it) and paid the buyer pro-rated rent for the month in escrow (about $800). So the net rent that I received is about $800 less than the rent that my property manager collected and reported on form 1099-MISC. How can I fix this so that I am not paying taxes on this $800? Thank you.