A jury's recommendation for death must now be unanimous.
The Florida Supreme Court handed down the ruling on Friday after finding Florida's law allowing for non-unanimous recommendations to be unconstitutional.
The Supreme Court ruled in January that Florida's unique system for sentencing people to death is unconstitutional because it gives too much power to judges — and not enough to juries — to decide capital sentences.
The 8-1 ruling said that the state's sentencing procedure is flawed because juries play only an advisory role in recommending death while the judge can reach a different decision.
The decision will likely trigger sentencing appeals from some of the 390 inmates on the Florida's death row, a number second only to California.