SALT LAKE CITY—The Vatican has ordered Roman Catholic dioceses worldwide to withhold member registries from Mormons who perform posthumous baptisms.

The order, first reported by Catholic News Service, was issued by the Vatican Congregation for Clergy. Officials said the step was taken to prevent members of The Church of Jesus Christ of Latter-day Saints from baptizing by proxy their Catholic ancestors.

Monsignor J. Terrence Fitzgerald said the Catholic diocese in Utah already has a policy to restrict baptismal records only to those entitled to see the records.