Mark Hamill says the "major change" in The Long Walk made him "nervous," but Stephen King loved it: "I thought, oh good, I've done my job correctly"

Cooper Hoffman and David Jonsson in The Long Walk.

Mark Hamill says he was a little worried about the ending of The Long Walk, but was glad that King approved... and was even happier about the audience reaction.

Warning: Massive spoilers for The Long Walk ahead! If you haven't seen the movie, turn back now!