Cuba has removed a ban on Cubans entering or leaving the country by sea, clearing the way for a resumption of cruises from the US.
The Cold War era rule previously stipulated that Cubans could only enter or leave by plane.
Cruise operator Carnival has been given permission by both governments to run ships between Florida and Cuba.
But the restriction meant it could not take bookings from Americans of Cuban origin.
That led to protests and the company said it would postpone its cruises unless Cuba changed its entry policy.
The first US cruise to Cuba in 50 years is due to set sail from Miami on 1 May with up to 704 passengers on board.
Days later, the Rolling Stones played their first concert in the country.