'We designed it and they borrowed it and if we wanted to clear the matter up they should change their flag, ' Peters told reporters.
Mr Peters alluded to Prime Minister Jacinda Ardern in his answer, who is now absent from Parliament on maternity leave.
The flags are indeed similar. The two countries have almost identical flags: New Zealand's is blue with a Union Jack emblem in the top left corner and four red and white stars on the right side; the Australian flag is also blue with a Union Jack in the corner, but it has one white star below that and five white stars to the right.
New Zealand's features four five-pointed, red stars to represent the Southern Cross.
Kiwis were asked to choose between the current flag and an alternate version that featured a silver fern on a black background and four red stars.
Fiji and New Zealand were initially a part of those discussions but decided not to join.
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Before 1901, New Zealand was considered a colony of Australia, and its name even appeared on the Australian Constitution. Should Australia or New Zealand or perhaps both, change flags?
Has the flag been an issue before?
At the time, the New Zealand Labor Party, which was in the Opposition, was fiercely against a change with Peters' opinion not swaying in the two years following.
The dig at Australia's flag reignited an old debate and came at a tense time for Australia and New Zealand. More New Zealanders are now in immigration detention in Australia than people from any other country.
As if it were not enough that people already confuse the New Zealand flag with Australia's, Kiwis are exhausted of being invisible, or at least overlooked as a nation.
The comment comes after Mr Peters, who is also the country's foreign minister, slammed Australia for deporting New Zealand nationals without trial.