Mackie said: "It was the best goal I have scored so far. Up there at number one.
"I had a similar effort come back off the underside of the bar against Derby a few weeks ago so this time I was delighted to see it fly into the top corner.
"It opened up in front of me so I chanced my luck and I am buzzing with the strike.
"We are four games unbeaten now and the confidence is getting higher and higher. We've got to crack on and build on this."