A federal appeals panel has upheld the 10-year prison sentence of a 68-year-old Omaha man for possession of child pornography.

Robert Cover was sentenced in March after he had pleaded guilty to the charge. Prosecutors say Cover had three videos and 39 images of child porn on his computer.

Cover’s sentence was enhanced because of his 1998 conviction for child sexual assault.

Cover appealed the sentence, arguing that the 10-year minimum should not have applied to him and that his sentence was unreasonably long.

But a three-judge panel of the 8th U.S. Circuit Court of Appeals found Wednesday that the 10-year minimum was correctly applied and that Cover waived any other challenge to his sentence when he entered his guilty plea.