High-flying Ipswich are the only League One side to have conceded fewer goals than Pompey this season.
But now Kenny Jackett is looking for his side to find their shooting boots and improve at the other end of the pitch.
They battled their way to a 1-0 victory over Lincoln earlier in the week, producing a display full of character, if a little short on creativity.
So Jackett wants Pompey to discover a ruthless edge in front of goal, as they aim to keep climbing the table.
The Blues boss said: “There is a genuine set of players here, who want to do well for themselves, each other and also the club.
“I felt there was a big effort on Tuesday night – which we needed – and it was nice to score from a set-piece after being on the wrong end of one a few days earlier.
"It’s up to us to make sure we break through because we have to do something about the lack of goals."
“There has been a lack of goals lately, though. We’ve tightened up at one end, but haven’t put enough away at the other.
“Whether you’re creating the chances is irrelevant – the bottom lines is how many you score. It’s a big thing.
“That might be about creating more openings or it might be about being more clinical when they do come along.
“But I do have confidence in my players that it will come and we certainly have the quality there to do that.
“It’s up to us to make sure we break through because we have to do something about the lack of goals, without losing anything in defence.”
Next up for Pompey is a trip to face a Bristol Rovers side who have lost their past two matches against Doncaster and Bolton.
Jackett said: “If we get our game right, we feel that we can pick up points against any side in this division, so we have to keep working away.
“We want to turn it into a good week for us and all our efforts are focused on making sure it’s six points out of six.
“It will be a tough game and we’ll analyse our opponents, respecting them while concentrating mainly on our own performance.”