The 22-year-old Antigua & Barbuda international, who signed from non-league side Wealdstone in the summer, has made the right-back position his own in recent weeks, playing every minute of the Chairboys' last 10 league outings.
"I'm buzzing," he told the club's official website. "I'm playing games, I'm enjoying it, I've got a good manager and there's a good set of lads here.
"I'm learning in every game I play in and I just want to progress."
Manager Gary Waddock added: "I'm delighted Marv has signed a new contract. He's come in, worked hard and took his opportunity when it came along.
"His performances have been really pleasing and we believe this is the ideal place for him to continue his development."
Source: PA
Source: PA