A 21-year-old man faces further time behind bars or a fine of up to $4000 after allegedly assaulting a guard at the Hawke's Bay Regional Prison late last year.
Prison director Leonie Aben confirmed a prisoner had been charged through the prison's internal misconduct system after assaulting a staff member on November 30.
The staff member was assessed by on-site medical professionals after allegedly being pushed and put in a headlock, she said.
The 21-year-old will appear in Hastings District Court later this month facing one charge of assaulting a prison officer.
Aben said the staff member reported having a sore shoulder, but did not require any off-site medical treatment.