Blackman headed to League Two side Wycombe at the start of the season and has played 25 times for the club.
"Jamal has been first class for us and he has real quality which is well above League 2 level, so it's fantastic for us to be able to keep him for the rest of the season,” Wycombe boss Gareth Ainsworth told the club’s website.
Jamal Blackman will remain at Wycombe until the end of the season
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"He commands his area superbly, his distribution is outstanding and he's made some saves which are out of this world to help us pick up some valuable points.
"I'd like to think we do things right here when it comes to developing young players and Jamal is another example of someone who's come in, worked hard and improved his game with us.”