They had to settle for a draw with Spurs at the DW Stadium after the ball bobbled off the unfortunate Emmerson Boyce into his own net in the 90th minute.
Martinez felt the match officials made an incorrect call over the incident, saying after the game: "If you see the replays, it puts extra salt in the wounds.
"It was not a free-kick - it should never have been a free-kick.
"Kyle Walker is pulling Jean Beausejour and he is too honest, staying on his feet.
"We need to accept that - sometimes when you are down there, the results or the lucky breaks don't go your way."