MEMORANDUM **

Efren Encarnacion-Castillo appeals the sentence imposed following his guilty plea to possession with intent to distribute methamphetamine in violation of 21 U.S.C. § 841(a)(1).

Encarnacion-Castillo contends that the district court erred in applying the Sentencing Guidelines as mandatory when imposing his sentence. Because Encarnacion-Castillo was sentenced under the then-mandatory Sentencing Guidelines, and we cannot reliably determine from the record whether the sentence imposed would have been materially different had *878the district court known that the Guidelines were advisory, we remand to the district court to answer that question, and to proceed pursuant to United States v. Ameline, 409 F.3d 1073, 1084 (9th Cir. 2005) (en banc). See United States v. Moreno-Hernandez, 419 F.3d 906, 915 (9th Cir. 2005) (extending Ameline’s limited remand procedure to cases involving non-constitutional Booker error).

REMANDED.