Teina Pora's lawyers are seeking up to $600 thousand more in compensation, after a successful legal challenge against the Government.

A judge said Pora should get more money for the 21 years he was wrongfully imprisoned for the murder of Susan Burdett.

Justice Rebecca Ellis said Justice Minister Amy Adams made an error in interpreting the guidelines around compensation.

Pora, who spent 21 years in jail in one of New Zealand's worst miscarriages of justice, took a judicial review against the Government's decision not to add inflation to compensation paid to him.

Mr Pora's lawyer Jonathan Krebs says his client's $2.5 million payout should be adjusted for inflation.