The United Nations Human Rights Office has urged the transitional authorities in Guinea to revoke a ban on public protests.
Earlier this month the country's military rulers issued a statement prohibiting gatherings in public places.
Opposition parties and civil society activists had expressed concern about the measures.
The UN's human rights spokesperson for Africa, Seif Magango, said the restrictions violated international norms and constituted a setback for democracy.
In September last year Guinea's President, Alpha Conde, was ousted in a military coup.
The leader of the takeover, Mamady Doumbouya, was sworn in as interim president a month later.