
891 P.2d 662 (1995)
133 Or. App. 271
STATE of Oregon, Respondent,
v.
Mehran MONTAZER, Appellant.
No. 10-93-07185; CA A84485.
Court of Appeals of Oregon.
Argued and Submitted January 31, 1995.
Decided March 8, 1995.
Review Denied June 13, 1995.
*663 Steven V. Humber, Deputy Public Defender, argued the cause, for appellant. With him on the brief was Sally L. Avera, Public Defender.
Richard D. Wasserman, Asst. Atty. Gen., argued the cause, for respondent. With him on the brief were Theodore R. Kulongoski, Atty. Gen., and Virginia L. Linder, Sol. Gen.
Before DEITS, P.J., and De MUNIZ and HASELTON, JJ.
DEITS, Presiding Judge.
Defendant was convicted of sexual abuse in the first degree. ORS 163.427. He was sentenced to a period of imprisonment "not to exceed eighteen (18) months." He appeals from the judgment, arguing that the trial court erred in its admission of certain evidence. He also argues that the court erred in not sentencing him to a definite term of imprisonment. We remand for resentencing.
We conclude that the trial court did not err in admitting the disputed evidence and affirm that assignment of error without discussion. Defendant's challenge to the sentence imposed by the trial court is that the sentencing guideline rules require the court to impose a definite sentence and that the court's imposition of a term of imprisonment "not to exceed eighteen (18) months" violates that requirement. OAR 253-05-005.
The state first argues, relying on State v. Guyton, 126 Or.App. 143, 148, 868 P.2d 1335, rev. den. 319 Or. 36, 876 P.2d 782 (1994), that, under ORS 138.222(2)(a), defendant's sentence is not reviewable because it is within the presumptive sentencing range under the guidelines. The parties agree that the applicable gridblock was 8-I and that the presumptive sentence under that gridblock is 16 to 18 months. The problem here, however, is that the trial court identified the range but not the specific term of imprisonment and, therefore, technically it was not a presumptive sentence. Accordingly, ORS 138.222(2)(a) does not preclude our review of that portion of the judgment in which the trial court imposed only a sentence range.
It is undisputed, however, that defendant did not preserve this objection before the trial court. Accordingly, we need to determine whether this defect in the imposition of sentence is "apparent on the face of the record." See ORAP 5.45(2). We conclude that it is. On the face of the record, it is apparent that the trial court did not identify a definite term of imprisonment as the rule requires. State v. Tremillion, 111 Or. App. 375, 826 P.2d 95, rev. den. 313 Or. 300, 832 P.2d 456 (1992). The state argues that our decision in Tremillion is distinguishable, because the court's order here does state the length of the term of incarceration18 months. However, we simply do not *664 agree that the length of the sentence to be served is clear from the court's order.
As discussed above, the court identified a sentence range, but did not impose a determinate term, as required by the applicable rules. Because of the difficulties in administering such an indefinite "sentence," and because the correction of this error may be accomplished with a minimum of judicial time, we are persuaded to exercise our discretion and review this unpreserved error. We remand for resentencing.
Conviction affirmed; remanded for resentencing.
