Striking Armaguard Currency Management workers in Auckland and Wellington have agreed to go back to work - with minimum upheaval to money machine users.
Forty ACM staff, who service bank ATM machines, walked off the job today over collective agreement negotiations.
The industrial action took banks by surprise and the Service and Food Workers Union stoked fears that ATMs might run out of cash.
"The guys have made it very clear that unless they're happy with the outcome, they have shown they will strike."
Kiwibank says its machines might have run out of money in a couple of days if they weren't serviced.
Ms Ovens says an ACM manager and some cash processing staff topped up some ATMs today before the striker workers agreed to go back to work.
Many banks dropped Chubb in favour of ACM, an Australian company, in 2008.