When French students return to school in September they’ll have to leave one of their most prized possessions at home – their smartphone.

French lawmakers on Monday passed legislation banning students as old as 15 from bringing smartphones and tablets to school or having them turned off at least, according to the Agence France-Presse. Officials in support of the new rule described the policy as a way to shield children from addictive habits and to safeguard the sanctity of the classroom.

“We know today that there is a phenomenon of screen addiction, the phenomenon of bad mobile phone use,” education minister Jean-Michel Blanquer told French news channel BFMTV, according to CNN. “Our main role is to protect children and adolescents. It is a fundamental role of education, and this law allows it.”

The law, however, does make exceptions for educational use, extra-curricular activities and for students with disabilities, the AFP reports.

Even before the new policy was voted in, French law prohibited students from using their phones while class was in session. But during the 2017 French presidential election, Emmanuel Macron pledged to impose a school ban on phones entirely.

This isn’t the first French law designed to beat back the encroachment of digital technology in everyday life. Last year the government passed a law requiring French companies to draft rules that limited work emails and work-related technology outside the office.