'Jumanji' Star Film Reboot Not Right Without Robin

8/8/2015 12:10 AM PDT

'Jumanji' Star -- Film Reboot Not Right Without Robin Williams

EXCLUSIVE

Bradley Pierce, the little kid from "Jumanji," doesn't want Sony to roll the dice on the reboot ... and for good reason.

Pierce hasn't been asked to reprise his role as Peter Shepherd from the original '95 film, which also starred Robin Williams

The snub's not what's bothering Pierce about the remake ... it's the fact that Williams obviously isn't in the picture ... he carried the film to blockbuster status.

Pierce says he believes Williams would have had his doubts about a reboot, and not because the late actor didn't want to wait for someone to roll another 5 or 8.