Iran and Oman are preparing to jointly impose a toll on vessels using the Strait of Hormuz, according to a report citing an Iranian official and four diplomats. The move comes despite open objections from the United States. The New York Times reported the plan on Tuesday, noting that the two countries intend to charge a fee for passage through the strategic waterway.

Earlier this month, the United States and Iran signed a 14-point plan allowing commercial ships to transit the strait safely without paying any fees. However, that agreement, like other parts of the deal, is valid only for a 60-day negotiation period. As part of the arrangement, Iran and Oman were tasked with developing a joint plan for the strait’s management.

If the proposed toll is implemented as part of a post-war regional business model, it would end the centuries-old tradition of free passage through the Strait of Hormuz, a key global maritime route.