"However because the time to file the appeal expires on September 26 this decision had to be taken today."
Justice Ellis said the minister had made an error in interpreting the guidelines around compensation.
"That error caused, or was compounded by, further errors in the minister's advice to Cabinet and in the reasons for the Cabinet decision itself."
Pora's lawyer, Jonathan Krebs, said an actuary had estimated the inflation would add an additional $500,00 to $600,000 to the compensation payment of $2.52 million received by Pora who had spent 20 years in prison.