The company said it now has to 15 September to decide whether to go ahead with the ship.
It ordered two firm 63,800-dwt vessels in February and originally had to declare the option by May.
Croatia's Atlantska Plovidba has agreed an extension to its option agreement for another ultramax bulker at Qingshan Shipyard.
The company said it now has to 15 September to decide whether to go ahead with the ship.
It ordered two firm 63,800-dwt vessels in February and originally had to declare the option by May.