
754 P.2d 916 (1988)
91 Or.App. 239
STATE of Oregon, Respondent,
v.
Calvin HARPER, Appellant.
C86-12-36284; CA A43913.
Court of Appeals of Oregon.
Argued and Submitted December 24, 1987.
Decided May 18, 1988.
Gary D. Babcock, Public Defender, Salem, argued the cause for appellant. With him on the brief was John P. Daugirda, Deputy Public Defender, Salem.
Douglas F. Zier, Asst. Atty. Gen., Salem, argued the cause for respondent. With him on the brief were Dave Frohnmayer, Atty. Gen., and Virginia L. Linder, Sol. Gen., Salem.
Before WARDEN, P.J., JOSEPH, C.J.,[*] and VAN HOOMISSEN, J.
VAN HOOMISSEN, Judge.
Defendant appeals his conviction for felony driving while suspended (DWS). ORS *917 811.175. The dispositive issue is whether he may collaterally attack the validity of a previous revocation of his driving privileges. We reverse.
On May 31, 1983, defendant received a notice from the Motor Vehicles Division (MVD) that, because the Multnomah County Circuit Court had designated him a habitual traffic offender (HTO), his license was revoked, effective June 6, 1983. The notice did not inform defendant that, if he requested a hearing, the effective date of the revocation would be postponed, pending the hearing. The circuit court's order prohibited him from operating a motor vehicle in this state. ORS 809.640.
On April 1, 1985, defendant was convicted of violating the HTO order, a felony offense. See ORS 811.185. On May 31, 1985, MVD revoked defendant's license again, because, by violating the HTO order, he had used a vehicle in the commission of a felony. On November 25, 1986, he was arrested for operating a vehicle while the HTO order and 1985 revocation were still in effect. He was charged by indictment with violating the HTO order, ORS 811.185, and with felony DWS. ORS 811.175.[1]
Defendant moved for judgment of acquittal on both charges, contending that the 1983 revocation of his license is void, because the notice of revocation did not tell him that the revocation would be postponed if he requested a hearing. See State v. Atkinson, 305 Or. 295, 751 P.2d 784 (1988). The trial court granted the motion on the HTO violation, because it held that the 1983 notice of suspension was inadequate. However, the court denied defendant's motion on the DWS charge. The court found that the underlying 1983 HTO order was void[2] and that the 1985 revocation grew out of the void order.[3] The present felony DWS charge relies on the 1985 revocation, because the essential element of the charge is that defendant drove after his license had been revoked for committing a felony using a vehicle. ORS 811.175. However, the court held that defendant could not now collaterally attack the 1985 order in defending the DWS charge, because he had not raised the invalidity of the HTO order as a defense when his license was revoked in 1985. Defendant was convicted of felony DWS.
*918 Defendant relies on State v. Hardt, 81 Or. App. 607, 726 P.2d 953, adhered to, 83 Or. App. 221, 730 P.2d 1278 (1986), rev. den. 303 Or. 74, 734 P.2d 354 (1987), to argue that he may raise the invalidity of the HTO order and thus successfully defend the DWS charge. The state responds that Hardt may not be read to allow a collateral attack at this point.
In Hardt, the defendant had been convicted, in 1977, of driving under the influence of intoxicants (DUII), and his license had been suspended. In 1980, he was twice convicted of DWS; both convictions depended on the suspension for DUII. Because of the three convictions, the defendant was designated an HTO and prohibited from driving. He was later indicted for violating that order. The trial court granted his motion to dismiss the indictment, because the HTO order was based on the three earlier convictions which grew out of the DUII conviction and the defendant had successfully had the DUII set aside in a post-conviction proceeding. On appeal, we held that the DWS convictions could not be used, because they were based on the void DUII conviction. Therefore, the original invalidity of the DUII conviction prohibited the use of the subsequent DWS convictions to gain an HTO order violation conviction. 81 Or. App. at 610-611, 726 P.2d 953. We also rejected the state's argument, in its petition for reconsideration, that, because the defendant had not raised the invalidity of the DUII conviction as a defense to the DWS convictions, he could not assert it in the HTO proceeding. See State v. Hardt, supra, 83 Or. App. at 223-24, 730 P.2d 1278.
The same reasoning applies here. Although defendant did not raise the invalidity of the 1983 HTO order to defend the 1985 revocation, he may now assert its invalidity as a defense. He did so, and the trial court held the 1983 order void. The state does not challenge that conclusion. A conviction of felony DWS cannot be based upon a violation of an invalid revocation, which is itself based on an invalid HTO order. See State v. Hardt, supra, 81 Or. App. at 610, 726 P.2d 953.
Reversed.
NOTES
[*]  Joseph, Chief Judge, vice Young, J., deceased.
[1]  ORS 811.175 provides, in relevant part:

"(1) A person commits the offense of driving while suspended or revoked or in violation of an occupational or probationary permit if the person does any of the following:
"(a) Drives a motor vehicle upon a highway during a period when the person's driving privileges or right to apply for driving privileges have been suspended or revoked in this state by a court or by the division.
"* * *
"(4) The offense described in this section, driving while suspended or revoked or in violation of occupational or probationary permit, is a Class A misdemeanor except that if the suspension or revocation resulted from any of the following the offense is a Class C felony:
"* * *
"(c) Any crime punishable as a felony with proof of a material element involving the operation of a motor vehicle."
ORS 811.175 has since been amended. Or. Laws 1987, ch. 730, § 1; Or. Laws 1987, ch. 801, § 9.
[2]  The statutes in effect at the time of the initial revocation did not require the notice discussed in State v. Atkinson, 305 Or. 295, 751 P.2d 784 (1988). However, the state did not raise that argument below and, on appeal, did not challenge the trial court's ruling that the 1983 order was void.
[3]  The state contends that it provided evidence that the felony suspension was proper and that defendant did not carry his burden of rebutting that evidence. See State v. Fritz, 85 Or. App. 1, 735 P.2d 1228, rev. den. 303 Or. 700, 740 P.2d 1213 (1987). We disagree. Defendant introduced certified MVD records which established that the 1985 revocation was for driving in violation of the invalid order. The trial court recognized that fact, but held that it was too late for defendant to assert the collateral attack regarding the DWS charge. The court stated:

"Now, I do agree that the defense is entitled to argue from the record that has to be the conviction of driving in violation of a Court order on April 1st, 1985, that offense having occurred on February 27th, 1985. I take that from the driving record of that part of the certified record from the Motor Vehicle Division, but I don't believe that we are entitled to go one step beyond that and say that that conviction should not have been had because Mr. Harper had a defense based on the statute; that he either did not assert it or if he did the Trial court improperly overruled it and he evidently did not appeal.
"I will find Mr. Harper guilty of Count II, felony driving while suspended."
