The Pacers took the lead in the series on Sunday night thanks to a 107-96 triumph, but Hill believes that the title contenders can't afford to become complacent heading into the second game on Tuesday.
"There's nothing to celebrate," the point guard told reporters. "It's not like we won a championship. It's one game.
"Yes, it's good but if we come out and lay an egg on Tuesday, this game doesn't mean anything."
Hill scored 15 points in the win over the Heat on Sunday.