why is it asking me to report as self income for a 1099 MISC from my previous employer for my vacation payout?

I received a payout for my vacation from a previous employer which was reflected on a 1099-MISC. The 1099 lists it as other income on line 3 and no taxes were withheld. Turbotax is asking me to count it as self employed income and use a schedule C when it should not be since it came from my previous employer.