The Department of Corrections says a lot of work has gone in to protecting prison guards.
There have been calls for extra security measures after an attack on an officer at Auckland Prison, Paremoremo on Saturday, but chief custodial officer Neil Beales of Corrections says it's a dangerous job by its nature.
"We've beefed up our intelligence, operations and tactical response ability," he told Newshub.
"We've done a huge amount of work towards safety, but the reality is we deal with New Zealand's most difficult and challenging citizens."
The guard was taken to hospital for treatment, and released soon after.
"Every single day they prevent more things than occur. Our jails are safer because of what they do," says Mr Beales.
Three prisoners were also taken to hospital after the attack, which involved improvised weapons.
Corrections told Newshub in a statement police have been informed and are investigating.
"We have a zero tolerance towards violence policy," said prison director Andy Langley.
"No assault against staff or other prisoners will be tolerated in prison. However, unfortunately from time to time this will occur. Any prisoner who does use violence towards staff or fellow prisoners will be held to account."
Corrections Association president Alan Whitley said officers need easier access to pepper-spray in the prison's wings.
Sprays are available, but it isn't easy for guards to get their hands on it quickly.
Newshub.
