A judge has weighed in on a Maine law that automatically unenrolls voters from political parties when the party’s membership fails to reach a threshold set by the state.

Maine state law requires political parties to enroll at least 5,000 voters in the year before a general election and then double that number by the next election in order to hold a convention. Failing that, members of the party will be unenrolled.

According to the Bangor Daily News, U.S. District Judge Lance Walker said that part of the law is unconstitutional, representing a victory for the state’s Libertarian party.

The judge didn’t take issue with the numerical requirements, but said automatic disenrollment is burdensome for smaller parties, and that voters unenroll from parties for any number of reasons.

In Maine, candidates running in minor parties like Libertarians need to collect the same number of signatures as larger ones, but are restricted to collecting those signatures only from voters who are enrolled in that party.