Spain will legalise about 300,000 undocumented migrants a year, starting next May and through 2027, the country’s migration minister said on Wednesday.

The policy aims to expand the aging country’s workforce and allow foreigners living in Spain without proper documentation to obtain work permits and residency. Spain has largely remained open to receiving migrants even as other European nations seek to tighten their borders to illegal crossings and asylum seekers.

Spain needs around 250,000 registered foreign workers a year to maintain its welfare state, Migration Minister Elma Saiz said in an interview on Wednesday. She contended that the legalization policy is not aimed solely at “cultural wealth and respect for human rights; it’s also prosperity.”

“Today, we can say Spain is a better country,” Saiz told national broadcaster Radiotelevision Espanola.

Spanish Prime Minister Pedro Sanchez has often described his government’s migration policies as a means to combat the country’s low birthrate. In August, Sanchez visited three West African nations in an effort to tackle irregular migration to Spain’s Canary Islands.