A wine collector convicted of fraud for manufacturing fake vintage wine in his California kitchen has asked a judge for leniency Thursday, saying his actions were foolish.

Rudy Kurniawan’s letter to Southern District Judge Richard Berman was filed the same day his sentencing was postponed to July 17. A jury convicted Kurniawan in December of mail and wire fraud charges that could bring up to 40 years in prison. Prosecutors say federal sentencing guidelines call for him to serve at least 11 years in prison while defense lawyers say the two years he has spent in prison already is sufficient punishment.