Ohio’s process for updating its voter registration rolls does not violate the National Voter Registration Act, the U.S. Supreme Court ruled on Monday.

In a case closely watched by civil rights and election reform groups, the court, voting 5-4, rejected claims that the state’s “supplemental” process for identifying ineligible voters ran afoul of federal prohibitions on using failure to vote as the reason for striking voters from the registration rolls. Justice Samuel Alito Jr. wrote the majority opinion.