Security reinforcements were put on stand-by and Mount Eden prison locked-down after disorder involving a group of up to 50 prisoners.
The stand-off lasted for an hour.
Corrections northern regional commissioner Jeanette Burns said media reports describing the disorder as a riot were incorrect.
"A group of prisoners in one unit had refused to be locked. This was not a riot.
"The prison was put into lockdown, and the wider security of the prison and community was always maintained. The good work of staff ensured the incident was resolved peacefully."