 Mackin finished the season with 13 appearances and 1 goal before being released by York in June 2011 after being told he could find another club.Mackin signed for newly promoted Conference Premier club Alfreton Town on 2 July 2011 on a one-year contract.His debut came after starting in a 1–1 home draw with Darlington on 23 August 2011, scoring his first goal with a 43rd-minute penalty in a 1–0 victory away to York on 29 August.