The Senegal striker has found the net in the Toon's last three home games, with all the goals coming deep into injury-time.
"We'd like him to score earlier in the game," said midfielder Marveaux.
"I don't know how he does it, but Papiss has left it so late recently.
"But that was a massive goal and a massive win against Fulham because we put everything into the game.
"Maybe it's the sign of a good team that we're scoring so many late goals."