Prior to last night's 2-0 win over Wigan, the 21-year-old centre back had not featured in The Dons last five matches.
However, Martin has admitted he was impressed by O'Hora's attitude after being dropped.
He said: "His attitude is incredible for a young guy.
“I had a chat with him about leaving him out, but he showed the attitude we wanted.
“He said he would get his head down and work and take it."
O'Hora played the full 90 minutes in MK Dons 2-0 win over Wigan at the Stadium MK.
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