Government officials say the decision means the schedule for one type of ship will get pushed back so the other can be built first.
The officials held a background briefing today on the progress of the $35-billion shipbuilding procurement project.
In October 2011, the federal government awarded the Irving shipyard a $25-billion deal to build 21 combat vessels in all.
Seaspan Marine Corp. of Vancouver is to build seven vessels under an $8-billion contract for non-combat ships.
A contract for another $2 billion for smaller vessels is yet to be awarded.