Petitioner is appealing from the summary denial of his Criminal Procedure Rule No. 1 motion. In order to obtain post-conviction relief under Rule No. 1 (now R.Cr.P. 1.850, 33 F.S.A.), it is necessary that one seeking such relief be in custody by virtue of the sentence appealed from. An appeal from a judgment denying a motion for post-conviction relief under Rule No. 1 becomes moot upon completion of the service of the sentence. Desrosiers v. State, Fla.App.1966, 189 So.2d 834; Smith v. State, Fla.App.1965, 175 So.2d 243; Young v. State, Fla.App.1964, 167 So.2d 622. It appears from the record that the sentence appealed from has already expired. Accordingly, petitioner’s appeal must be dismissed.