Additional staff have been brought in to Mt Eden prison since Corrections stepped in to run the jail last month, the department has confirmed.
However, Serco is being urged to pay for more staff before it once again takes over management of the prison.
Corrections took over the running of the jail, after private operator Serco came under fire following a series of incidents over the last few weeks.
Yesterday, the Corrections ran into problems, when an inmate was discovered dead in his prison cell.
The prisoner, 63-year-old Liberty Charles Baker, was due to be sentenced in the High Court at Whangarei this week after pleading guilty to nearly 80 charges including rape, sexual violation, assault, kidnapping, threatening to kill and grievous bodily harm.