Winston Peters will find out he's the Acting Prime Minister of New Zealand via a text message.
Mr Peters will take over when Prime Minister Jacinda Ardern is admitted to hospital to have her baby.
Minister for Children Tracey Martin told Newshub the news will be shared via a text message.
"I'm waiting to get a text to be told that I'm the acting Minister of Child Poverty Reduction. I will know when [Ardern's] having a baby because I'll get a text saying I'm taking over that portfolio.
"There will be a text to somebody and he'll know he's acting Prime Minister," she said.
Ms Martin said Mr Peters will be a steady pair of hands.
"Nothing will change. That's probably the biggest, strangest thing about this conversation that's taking place in the media.
"Government will go on. It's not like it's going to be a big drama."