After he was sentenced upon his conviction of illegal reentry following deportation for an aggravated felony, Sergio Hernandez-Arellano filed his notice of appeal twenty-one days after judgment was entered in the district court. 1 Although Hernandez-Arellano’s notice of appeal is untimely, see Fed. R.App. P. 4(b)(l)(A)(i), we remand the case to the district court to determine whether the time for filing a notice of appeal should be extended under Federal Rule of Appellate Procedure 4(b)(4). See United States v. Austin, 217 F.3d 595, 597 (8th Cir. 2000); United States *506 v. Petty, 82 F.3d 809, 810 (8th Cir. 1996) (per curiam).