Cesar Castillo-Segura (Castillo) appeals his conviction and the sentence he received after he pleaded guilty to illegal reentry in violation of 8 U.S.C. § 1326. Castillo argues that the “felony” and “aggravated felony” provisions in 8 U.S.C. § 1326(b)(1) and (b)(2) are unconstitutional in light of Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), and Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004). Castillo’s argument concerning the constitutionality of 8 U.S.C. § 1326(b) is, as he concedes, foreclosed. See Almendarez-Torres v. United States, 523 U.S. 224, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998); United States v. Izaguirre-Flores, 405 F.3d 270, 277-78 (5th Cir.2005), cert. denied, — U.S.-, 126 S.Ct. 253, 163 L.Ed.2d 231 (2005) (No. 05-5469). To the extent that Castillo relies on United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), to support this argument, nothing in the Supreme Court’s Booker decision affected the validity of 8 U.S.C. § 1326(b) and Almendarez-Torres. See Booker, 125 S.Ct. at 756.
Castillo also argues that the district court erred by imposing a sentence pursuant to the mandatory federal sentencing guideline system that was held unconstitutional in Booker. Castillo argues that, because he argued in the district court that Blakely applied to the Guidelines, this court reviews his Booker argument de novo. The Government agrees.
This court, not the parties, determines the proper standard of review. See United States v. Vontsteen, 950 F.2d 1086, 1091 (5th Cir.1992). We need not decide here whether Castillo’s objection preserved the claim for review because Castillo has shown plain error. Because the district court erred in sentencing Castillo pursuant to a mandatory guidelines scheme, he meets the first two requirements for relief under a plain-error analysis. See United States v. Olano, 507 U.S. 725, 731-37, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993); United States v. Valenzuela-Quevedo, 407 F.3d 728, 733 (5th Cir.2005), cert. denied, — U.S.-, 126 S.Ct. 267, 163 L.Ed.2d 240 (2005) (No. 05-5556). Castillo has also shown that the error affected his substantial rights by “pointing] to statements in the record by the sentencing judge demonstrating a likelihood that the judge sentencing under an advisory scheme rather than a mandatory one would have reached a significantly different result.” United States v. Pennell, 409 F.3d 240, 245 (5th Cir.2005); United States v. Mares, 402 F.3d 511, 517-18, 521 (5th Cir.2005), cert. denied, — U.S. -, 126 S.Ct. 43, 163 L.Ed.2d 76 (2005).
Accordingly, Castillo’s conviction under 8 U.S.C. § 1326 is AFFIRMED; his sentence, however, is VACATED, and the case is REMANDED for further proceedings.
AFFIRMED IN PART; VACATED IN PART; REMANDED.