Gareth Evans couldn’t hide his disappointment after Pompey were denied at the death – and knocked off top spot.
Joe Jacobson’s penalty on 89 minutes secured a 2-2 draw for Wycombe at rain-wrecked Fratton Park this afternoon.
Earlier, skipper Evans had headed home Jamal Lowe’s right-wing cross to cancel out Bryn Morri’s first-half opener.
Then substitute Brett Pitman met another Lowe cross to put Kenny Jackett’s side 2-1 up with four minutes remaining.
But Fred Onyedinma was fouled by Christian Burgess, allowing the Chairboys to net at the death.
And with Peterborough winning 4-2 against Gillingham, it drops Pompey into second spot.
Evans said: ‘It was a difficult game, like it always is when you play against Wycombe, and we are probably disappointed not to win the game in the end.
‘I’ve played against Gareth (Ainsworth’s) team many times over the years, he always makes it difficult and the way they set up made it difficult for us to dominate the midfield.
‘But we still created chances, we felt like some of the decisions throughout the game went against us. Whether the penalty is the right decision or not needs to be seen.
‘They are a tough team to play against and from the way the game was panning out possibly would have been happy to have taken something out of the game.
‘But we’re probably disappointed not to take all three points in the end.’