The move comes less than 48 hours after the top-seeded Pacers took a 1-0 lead in the Eastern Conference finals with a 107-96 win over the two-time defending NBA champs.
But Miami still will not have center Greg Oden, who was signed primarily to contend with Hibbert. Oden remains inactive.
Indiana also made a change Tuesday, activating backup swingman Evan Turner after he recovered from strep throat. Turner was inactive in Game 1. Indiana deactivated little-used rookie forward Solomon Hill.