Colby Bishop had tried to get on the end of Owen Dale deliveries on a couple of occasions at the Pirelli Stadium.
But the ball would not quite land for the striker in the area – that was until the 86th minute of the match.
Already leading through a Sam Hughes own-goal, he deftly flicked home the winger’s cross to seal three points for Pompey at Burton.
And Bishop was delighted to see the Blues maintain their unbeaten start to the League One campaign.
The striker said: “You’re always going to be happy when you go away and pick up all three points, while also keeping a clean sheet.
“That’s especially the case when you’re facing a side with a new manager and make it very tough for you.
“I wouldn’t like to play against Owen when he’s like that. He’s so sharp and caused Burton all sorts of problems.
"There were a couple of times before when we didn’t quite connect, but he could see where I was pointing and put it exactly in the right spot."
“There were a couple of times before when we didn’t quite connect, but he could see where I was pointing and put it exactly in the right spot.
“I’ve come off a couple of times recently after not scoring and it’s frustrating because I’m a striker and want goals.
“But when you’re substituted after managing to find the back of the net, then you’re not really as fussed.
“There’s character in this squad and we’re a grounded group who work hard every day – I think that shows when we come to places like this and get results.
“We’re joint top at the moment and can’t complain about that, so we just have to keep doing what we’re doing.”
Bishop is now looking forward to returning to a packed Fratton Park to face third-placed Plymouth this weekend.
He said: “It’s the best atmosphere I’ve experienced and the fact I can enjoy that every couple of weeks is amazing.”