The New Zealand dollar was little changed near a 12-month high and may rally further if Britons vote to remain in the European Union.
The kiwi traded at US71.80c at 5pm yesterday, having earlier risen to US71.88c from US71.45c late on Wednesday.
The trade-weighted index was 75.99, having briefly touched a 13-month high of 76.06 from 75.87 late on Wednesday.
The latest two polls in Britain show the "leave" option, or Brexit, has slightly more support than remaining in the European Union.
By contrast, bookmaker Ladbrokes puts the odds of a "remain" vote at 76 per cent.