Sean Price has had his sentence reduced by a year. Credit:Mal Fairclough

Brutal murderer and rapist Sean Christian Price raised two middle fingers to the court after his non-parole jail time was reduced by a single year on Tuesday.

The convicted criminal, who represented himself and appeared via video link from prison, had one year shaved off his minimum jail term after Victoria's Court of Appeal ruled that a sentencing judge had earlier imposed a double punishment.

In March 2015, Price repeatedly stabbed 17-year-old Masa Vukotic in a Doncaster park. Two days later, he raped a woman who worked in a bookstore.

The Court of Appeal found County Court judge Meryl Sexton doubly punished Price in 2017 in jailing him for breaching a court supervision order in relation to the rape.