It was a brace that saw Ronan Curtis take his goal tally for Pompey to the half-century mark.
He opened the scoring against Gillingham at Fratton Park by converting a Marcus Harness delivery in the fourth minute.
And the forward then took advantage of a defensive error to turn home Sean Raggett’s cross just before the interval.
Curtis was delighted to play a pivotal role in the 3-1 success – capped by a Clark Robertson header – as the Blues continue their strong finish to the campaign.
The Republic of Ireland international said: “It’s a great honour for me and I’m over the moon to reach that total for the club.
“I was in my natural position on the left and really enjoyed it, although I’ll always give 100 per cent for Pompey.
"It’s a great honour for me and I’m over the moon to reach that total for the club."
“That’s three in three for me now and we want to end the season on a high by winning these last games.
“It shows you the level of the teams in this league that such a high points total is needed for the play-offs, but we also have to accept we haven’t been good enough overall.
“All we can do is try to get a couple more victories and then come back next season and try to change that.”
Gillingham are fighting desperately to beat the drop, but Pompey looked in control throughout the contest.
Curtis said: “We knew it was going to be tough against a side that sit in with five at the back and look to lump balls into your box.
“But we dealt with them really well, got the early goal and are delighted to come away with all three points.”