Opponents of a marriage equality law approved by lawmakers in Slovenia have succeeded in their effort to repeal the legislation.

According to the AP, preliminary results show that 64 percent of Slovenian voters voted Sunday against the measure, while 37 percent were in favor.

After lawmakers in the former communist nation approved the bill in March, the conservative group “Children are at Stake,” which is backed by the Roman Catholic Church, collected the 40,000 signatures needed to block the law from taking effect and put it up to a popular vote.

“This result presents a victory for our children,” Ales Primc, the group's leader, said of the vote.

Marriage equality supporters called the defeat a setback.

“It's not over yet,” Violeta Tomic, a lawmaker from the progressive United Left party, told the AP. “Sooner or later the law will be accepted.”