Louis Steven Petho appeals his sentence after pleading guilty to bank robbery, inviolation of 18 U.S.C. § 2113(a). On October 13, 2004, the district court sentenced him to 37 months' imprisonment. On appeal, Petho claims that his sentence violates United States v. Booker, 543 U.S. ___, 125 S. Ct. 738, 160 L. Ed. 2d 621 (2005) because it was improperly enhanced based on facts that he did not admit and that were not found by a jury beyond a reasonable doubt. He also argues that we should overrule United States v. Murphy, 306 F.3d 1087 (11th Cir.2002), and find that a note indicating the presence of a weapon does not constitute a threat of death for the purposes of § 2B3.1(b)(2)(F) of the Sentencing Guidelines. We find no reversible error and therefore affirm his sentence.

On April 26, 2004, Petho entered the Hancock Bank in Tallahassee, Florida, and handed a teller a note that said, "I have an explosive device. Please give me all your 100's, 50's and 20's." The teller gave him $4,140.00, and Petho left the bank. He turned himself in to the FBI on May 14, 2004, and provided a written statement admitting to the robbery. He later pled guilty to one count of bank robbery.

Under the Sentencing Guidelines, the base offense level for bank robbery is 20. The Presentence Investigation Report ("PSR") prepared by the United States Probation Office recommended a two-level enhancement because Petho took the property of a financial institution, and another two-level enhancement because the note he handed the teller constituted a threat of death. The PSR also recommended a three-level adjustment for acceptance of responsibility because Petho turned himself in and pled guilty. The PSR thus calculated a total offense level of 21, with a guideline imprisonment range of 37 to 46 months.

Petho objected to the PSR's recommendation of an enhancement for making a threat of death. At sentencing, he renewed that objection, and also filed an objection under Blakely v. Washington, 542 U.S. 296, 124 S. Ct. 2531, 159 L. Ed. 2d 403 (2004). On appeal, Petho argues that his sentence violates Booker, which extended Blakely to the Federal Sentencing Guidelines, and also that the Eleventh Circuit should overrule its precedent in United States v. Murphy to hold that a note indicating the presence of a weapon does not constitute a threat of death.

Because Petho preserved his Blakely/Booker claim at sentencing, we review that claim for harmless error. United States v. Paz, 405 F.3d 946 (11th Cir.2005). Non-constitutional error is harmless when it does not affect the substantial rights of the parties. See 28 U.S.C. § 2111; United States v. Guzman, 167 F.3d 1350, 1353 (11th Cir.1999). Under this standard, we must reverse "only if [the error] resulted in actual prejudice because it had substantial and injurious effect or influence" on Petho's sentence. See id. (internal quotation marks omitted); see also Kotteakos v. United States, 328 U.S. 750, 776, 66 S. Ct. 1239, 90 L. Ed. 1557 (1946).

There was error here because Petho was sentenced under a mandatory guidelines system.1 See United States v. Shelton, 400 F.3d 1325, 1330 (11th Cir.2005). However, when the district court sentenced Petho, it commented that "[t]he sentence I'm going to impose of 37 months is the same sentence that I would impose if Blakely were applied to the Federal Sentencing Guidelines so that the guidelines were non-binding." The court's comment establishes that the mandatory nature of the guidelines in place at the time of sentencing did not affect Petho's sentence. Thus, we find that the Booker error was harmless.

Petho also argues that we should overrule our decision in United States v. Murphy and hold that a note indicating the presence of a weapon does not constitute a threat of death. See 306 F.3d at 1089.2 We cannot do so, however, because we are bound by the ruling of the prior panel. See United States v. Hogan, 986 F.2d 1364, 1369 (11th Cir.1993) ("It is the firmly established rule of this Circuit that each succeeding panel is bound by the holding of the first panel to address an issue of law, unless and until that holding is overruled en banc, or by the Supreme Court.").

Thus, because we find no reversible error, we affirm Petho's sentence.

AFFIRMED.