He scored twice to bring the score back to 3–2 and nearly grabbed an equaliser to push for a regular place in the side. Mackie came off the bench for Joey Barton in the home game against Liverpool to inspire a comeback from 2–0 down, scoring the winner in a 3–2 victory at Loftus Road. He also scored QPR's second goal in the final match of the 2011–12 Premier League season in a 3–2 loss to Manchester City, who were crowned Champions that day.
The player scored twice to tie the score at 3-2 and nearly equalized to earn a starting position. He came off the bench for Joey Barton in a home game against Liverpool, scoring the winning goal in a 3-2 victory. He also scored QPR's second goal in their final match of the 2011–12 Premier League season, which ended with Manchester City winning 3-2.