The New Zealand dollar firmed slightly on approval of a temporary increase in the US debt ceiling, which came after a mixed session overnight.
The kiwi was at 84.18 US cents at 8am, up from 84.05 cents at 5pm. It traded as high as 84.41 cents overnight.
News that the US House of Representative voted on Wednesday US time to approve an increase to the nation's US$16.4 trillion borrowing ceiling for three months moved the kiwi from about 84.10 cents to 84.22 cents in morning trading here.
Without the vote, the US Treasury would not have had enough money to pay all of its obligations by late February, raising the risk of a default.
"I would have thought kiwi would have moved more than that," Imre Speizer, senior markets strategist at Westpac, said.