Conor Shaughnessy scored his first Portsmouth goal with a 98th-minute header to earn the League One leaders a 2-1 win at home to Wycombe.
Pompey, looking to extend their long unbeaten league run, handed Chelsea loanee Tino Anjorin his full debut in place of injured skipper Marlon Pack.
But they found it hard going in the opening 45 minutes, going in a goal down at half-time.
There had been little in terms of efforts on goal from either side before Wycombe took the lead after 22 minutes.
An inswinging corner from Luke Leahy saw skipper Josh Scowen get ahead of two defenders to steer the ball home at the near post.
Constant Pompey pressure straight from the restart saw them equalise after 58 minutes.
Just two minutes after Abu Kamara failed to connect with a Paddy Lane cross, he made amends by crossing from the byline for Colby Bishop to stab home.
Shaughnessy nodded the winner from a Jack Sparkes cross deep into injury time to send the home fans wild.
