Affirmed by unpublished PER CURIAM opinion.

Unpublished opinions are not binding precedent in this circuit.

*802 UNPUBLISHED

Stanley Carl Burkhardt appeals the district court’s order committing him as a sexually dangerous person under the Adam Walsh Child Protection and Safety Act of 2006, 18 U.S.C. § 4248(a) (2006). We have reviewed the record and affirm.

Burkhardt makes only two arguments on appeal. First, he asserts that the civil commitment statute, 18 U.S.C. § 4248, is actually a criminal statute, though it is nominally civil, and that it violates equal protection principles because it applies only to persons held in federal custody. As Burkhardt recognizes, however, these lines of argument are entirely foreclosed by our decision in United States v. Timms, 664 F.3d 436, 444-19, 455-56 (4th Cir. 2012) (ruling that § 4248 does not violate equal protection guarantees and is not a criminal statute).

Second, Burkhardt contends that the district court erred in permitting the Government to introduce the testimony of one of Burkhardt’s previous victims, given the Government’s failure to apprise Burkhardt prior to the hearing that the victim was available to testify. The district court’s decision to permit the testimony of a witness not included on a party’s pretrial witness list is reviewed for abuse of discretion. United States v. Fulks, 454 F.3d 410, 421 (4th Cir. 2006). Moreover, even where a district court abuses its discretion, its evidentiary decisions are reviewed for harmless error. Fed.R.Civ.P. 61; United States v. Johnson, 617 F.3d 286, 292 (4th Cir. 2010). In order to find a district court’s error harmless, this court need only be able to say “with fair assurance, after pondering all that happened without stripping the erroneous action from the whole, that the judgment was not substantially swayed by the error.” Kotteakos v. United States, 328 U.S. 750, 765, 66 S.Ct. 1239, 90 L.Ed. 1557 (1946).

Although the Government’s failure to disclose the victim on its pretrial witness list is indeed a matter of concern, we nevertheless conclude upon a review of the record that the admission of the victim’s testimony was at worst harmless error. Not only was the victim’s testimony of minimal importance to the ultimate issue in the hearing, given the stipulations entered into by the parties, but Burkhardt also failed to take advantage of the opportunity given him by the district court to delay the hearing in order to remediate any disadvantage occasioned by the Government’s eleventh-hour disclosure. See Southern States Rack And Fixture, Inc. v. Sherwin-Williams Co., 318 F.3d 592, 597 (4th Cir. 2003). To the extent that Burk-hardt contends that the district court’s conduct violated his due process right to confront adverse witnesses in his civil commitment hearing, we conclude that any such error was likewise harmless. See Chapman v. California, 386 U.S. 18, 24, 87 S.Ct. 824, 17 L.Ed.2d 705 (1967); United States v. Mackins, 315 F.3d 399, 405 (4th Cir. 2003).

Accordingly, we affirm the judgment of the district court. We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

AFFIRMED.