Defendant appeals his conviction, after a trial to the court, for the crime of possession of a controlled substance. ORS 475.992(4). He contends that the court erred in not having him execute a written waiver of trial by jury. ORS 136.001; Or Const, Art I, § 11. The state concedes error, and we agree. State v. Cullett, 86 Or App 219, 738 P2d 611 (1987).

Reversed and remanded for a new trial.