A man who raped a woman in Northampton has had his sentence reduced at the Court of Appeal.
Nhlanhla Monyai, 31, was given an Indeterminate Public Protection (IPP) sentence in March last year.
It means an offender can be kept in jail as long as they are considered to pose a serious risk to the public.
Appeal Court judges changed the IPP to an eight-year jail sentence, ruling the assessment of Monyai as dangerous was not justified.
Monyai persuaded a young, foreign student from the centre of Northampton to get into his car in February 2010 then drove her to wasteground where he raped her.
He had tried to lead away another young woman earlier that evening.
He was jailed indefinitely at Northampton Crown Court after admitting three counts of rape and one of false imprisonment.
His lawyers appealed against the sentence, arguing it was too harsh given a lack of previous convictions for similar offences.
Lord Justice Richards, sitting with Mr Justice Roderick Evans and Judge Nicholas Cooke QC, said the woman had been left traumatised by the attack.
He expressed sympathy with the original open-ended sentence but ruled the IPP must be quashed as it was based on a finding of dangerousness not open to the judge.