Joe Gary Rivas, Jr., appeals the sentence imposed for his conviction on one count of conspiracy to import cocaine and marijuana, arguing that the district court’s determination of drug quantity violated the Sixth Amendment rule of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). As Rivas preserved the issue, we review for harmless error, which requires the Government to demonstrate beyond a reasonable doubt that the district court would have imposed the same sentence if the Sentencing Guidelines had been advisory. See United *310 States v. Pineiro, 410 F.3d 282, 284 (5th Cir. 2005).

We reject the Government’s contention that there was no error because Rivas admitted the drug quantity. Rivas admitted only to importing at least five kilograms of cocaine and at least 1,000 kilograms of marijuana. This does not establish that Rivas pleaded guilty to the specific amounts of 264 kilograms of cocaine and more than 9,000 kilograms of marijuana determined by the Presentence Report. See, e.g., United States v. Garcia, 416 F.3d 440 (5th Cir. 2005) (finding Sixth Amendment error where defendant pleaded guilty to conspiracy to possess with intent to distribute more than 1,000 kilograms of marijuana, and district court determined total amount to be 48,651.7 kilograms).

In light of Booker, the district court’s determination of drug quantity constitutes error. See Pineiro, 410 F.3d at 286. We also conclude that the error was not harmless. The fact that the court sentenced Rivas to the maximum sentence within the guidelines range is insufficient to satisfy the Government’s burden. See United States v. Woods, — F.3d -, No. 04-11058, 2006 WL 163475, at *3 (5th Cir. Jan.24, 2005). The Government’s contention that the district court could have imposed the same sentence likewise fails to show that the district court would have imposed the same sentence but for the Booker error.

Rivas raises no other complaint.

The case is remanded to the district court to decide whether to resentence the defendant.

REMANDED.