Parliament's decision to leave the alcohol purchase age unchanged at 18 has surprised and disappointed Prime Minister John Key.
Mr Key favoured splitting the age - leaving it at 18 in bars and raising it to 20 in supermarkets and liquor stores.
But that was the least popular of three choices in front of MPs on Thursday and a run off vote was held to decide whether the age should stay at 18 or be raised to 20.
The status quo won by 68 votes to 53.
"I was very surprised by the vote," Mr Key told reporters in Rarotonga on Friday, where he is attending the Pacific Island Forum meeting.
"I think there was a sense from the New Zealand public that they wanted to see some moderation to the purchase age... I am a little bit disappointed."
Mr Key says he's always been focused on the harm caused to young people by excessive drinking and lifting the purchase age in supermarkets might have helped curb that.
When his preferred option dropped off, Mr Key voted to keep the age at 18.
"I felt that moving it to 20 across the board didn't make sense," he said.
"I think we're seeing a lot of pre-loading, youngsters getting cheap alcohol and drinking a lot before they go to a licensed environment... I wasn't convinced the real harm was happening in that licensed environment."
NZN