Prime Minister John Key says he will be voting for Kyle Lockwood's black and blue version to be the alternative national flag.
The Silver Fern (Black, white and blue) was Mr Key's personal preference over the similar red, blue and white version by Mr Lockwood, he told reporters today.
A Melbourne-based architectural designer, Mr Lockwood has two of his flags in the final five flags heading for a showdown with the incumbent ensign.
The postal ballot to rate the five options takes place between November 20 and December 11.
A March referendum will pit the top-ranked design against the current Union Jack and Southern Cross based flag.
Mr Key also said he would most likely be discussing it again with Prince Charles and Camilla in Auckland tonight.
He would not reveal the prince's thoughts on the bid to get rid of the Union Jack, but said the royal family was quite comfortable with whatever decision New Zealanders made.
He also pointed out that the majority of Commonwealth countries had removed the Union Jack from their flag.