Rangers remain rock-bottom of the Premier League after Saturday's 2-0 defeat by Manchester United. Harry Redknapp's side are seven points from safety with just 11 games left.
"It is another game down, but no-one has stretched the margin," said Mackie.
"It's important for us to try and get a result, a few back-to-back results, so we could be in there.
"It is going to be hard but we've got to keep going, keep trying to play and get a result. That's all you can do."
On Saturday's game, Mackie conceded: "I think we were playing the champions, in my opinion. They are a top draw side and he (Rafael) has scored a worldie. If he hadn't done that, maybe we were in the game.
"It's hard when we keep going 1-0 down and have to chase a game. It's tough."
QPR have matches coming up against relegation rivals Southampton, Aston Villa, Wigan and Reading, with Mackie adding: "Next is Southampton and if we can get results against the teams in and around us it is almost like a double game."