After a jury trial held June 4 and 5, 1979, defendant was convicted of larceny in a building in connection with the theft of two hams from a Kroger store. MCL 750.360; MSA 28.592. On July 5, 1979, defendant was sentenced to a prison term of from two years and eight months to *580four years. A supplemental information charging defendant as a fifth offender was filed on June 7, 1979, after the larceny conviction, and on July 23, 1979, defendant pled guilty to this charge. MCL 769.12; MSA 28.1084. Accordingly, defendant’s original sentence was vacated and a negotiated sentence of 12-1/2 to 15 years was imposed. Defendant appeals by right, raising two issues concerning the applicability of the habitual offender statute. A separate appeal was filed regarding the underlying larceny conviction, and that conviction was affirmed by this Court in an unpublished per curiam opinion.1
Defendant first argues that the habitual offender statute is unconstitutional. While recognizing that the statute has been upheld on numerous occasions, defendant vigorously presented his arguments to the trial court and has done so again on appeal. We hold that the statute is constitutional. People v Palm, 245 Mich 396; 223 NW 67 (1929), People v Covington, 70 Mich App 188; 245 NW2d 558 (1976), lv den 402 Mich 843 (1977), People v Potts, 55 Mich App 622; 223 NW2d 96 (1974), lv den 396 Mich 826 (1976).
Defendant also argues that the prosecution could not properly proceed against him as a habitual offender because the supplemental information was not timely filed. In support of this position, defendant cites the Supreme Court’s decision in People v Fountain, 407 Mich 96; 282 NW2d 168 (1979). Fountain appears to involve two separate "rules” regarding the time in which a supplemental information charging a defendant as a habitual offender must be filed. The first was stated as follows:____
*581"A prosecutor who knows a person has a prior felony record must promptly proceed, if at all, against the person as an habitual offender. People v Hatt, 384 Mich 302; 181 NW2d 912 (1970); People v Stratton, 13 Mich App 350; 164 NW2d 555 (1968). The prosecutor is not foreclosed from proceeding against a person as an habitual offender after conviction on the current offense provided he is unaware of a prior felony record until after the conviction. MCL 769.13; MSA 28.1085. The only recognized exception to this rule is when the delay is due to the need to verify out-of-state felony convictions based on the 'rap sheet’. People v Hendrick, 398 Mich 410; 247 NW2d 840 (1976).” Id., 98-99.
In this aspect Fountain presented nothing new and merely restated existing law. Accordingly, there is no issue as to the "prospective” or "retroactive” effect of this part of Fountain. See People v Martin, 100 Mich App 447; 298 NW2d 900 (1980), People v Stein, 99 Mich App 781; 298 NW2d 638 (1980) (Cynar, J., concurring), People v Mohead, 98 Mich App 612, 619-620, fn 2; 295 NW2d 910 (1980). But see, People v Wilson, 99 Mich App 348; 297 NW2d 660 (1980).
The second "rule” of Fountain was stated near the end of the per curiam opinion:
"The habitual offender charges should have been filed with the information which charged the last felony to provide fair notice to the accused and avoid an appearance of prosecutorial impropriety.” Id., 99.
In a concurring opinion, the Chief Justice added that this simultaneous filing requirement was based on the Court’s supervisory powers over the practices and procedures used in Michigan courts. By requiring the simultaneous filing of supplemental informations, the Court went beyond anything *582that had previously been required. As a result, the issue of whether this new rule is to be given only prospective application or some form of retroactive effect has divided this Court.2
Because we are of the opinion that the supplemental information was not filed "promptly” under the first rule in Fountain, we are not confronted with the issue of whether Fountain is to be given retroactive effect.
The status of the pre-Fountain law regarding the timing of supplemental informations was thoroughly analyzed in Martin, supra, as follows.
In People v Stratton, 13 Mich App 350, 356; 164 NW2d 555 (1968), the Court stated that when the prosecution has knowledge of a defendant’s felony convictions prior to trial on the latest felony charge, the supplemental information should be filed before conviction on that charge. The habitual offender charge could be brought after the conviction whenever the prosecution fails to learn of the prior convictions before that time. See also, *583In re Brazel, 293 Mich 632, 639-640; 292 NW 664 (1940). The Stratton procedure was specifically adopted by the Supreme Court in People v Hatt, 384 Mich 302, 307-309; 181 NW2d 912 (1970).
In People v Marshall, 41 Mich App 66; 199 NW2d 521 (1972), the Court held that the Stratton-Hatt procedure was not mandatory, and that the prosecution had discretion to charge defendant as a habitual offender after conviction even where the prior convictions were known beforehand. The Court also noted, however, that such an exercise of discretion could run afoul of a defendant’s due process rights. Accordingly, the Court held that "where no good reason exists for the delay in filing a supplemental information charging the defendant as a subsequent offender, and the delay on the part of the prosecutor substantially prejudices defendant’s rights, the filing of that supplemental information clearly denies defendant his right to due process of law”. Id., 74. The practical result of such a holding was to render the Stratton-Hatt procedure mandatory unless there was a good reason for the delay or that delay did not substantially prejudice the defendant.
In People v Hendrick, 398 Mich 410; 247 NW2d 840 (1976), the Supreme Court restated the procedure culled from the above noted cases without disapproval. In Hendrick, the prosecution became aware of the extent of the defendant’s prior record about a week before the trial on the most recent charge, but no supplemental information was filed until after that trial resulted in a conviction. The prosecution explained that the delay resulted from the fact that several of the prior convictions were from other states and that prior to trial the only information regarding these convictions was con*584tained in an FBI "rap sheet”. Because the delay resulted from the need to verify these out-of-state convictions, the Court held that the prosecution had acted properly. As a result, the need to verify such information constituted a good reason for post-conviction filing, despite the fact that the prosecution had knowledge of the prior convictions before trial. In a dissenting opinion, Justice Levin took the position that verification of the information contained in the "rap sheet” was not sufficient cause to delay filing of the supplemental information. In addition, he demonstrated the substantial prejudice that results when a defendant is forced to defend against a charge without notice that the prosecution also intends to file a supplemental information by noting that the severity of the potential punishment often influences matters of trial strategy. Hendrick, supra, 423-424 (Levin, J., dissenting). See also, People v Taylor, 99 Mich App 613; 299 NW2d 9 (1980), People v Wilson, 102 Mich App 626; 302 NW2d 303 (1981) (Bashara, J., concurring), People v Wallace, 102 Mich App 386; 301 NW2d 540 (1980) (Bashara, J., concurring).
The Court in Martin summarized the analysis of pre-Fountain law as follows:
"(1) When the prosecutor had knowledge of a defendant’s prior convictions, a supplemental information charging the defendant as an habitual offender was to be filed prior to the conviction of the defendant on the current charge. When the prosecutor learned of the defendant’s prior convictions only after the conviction of the defendant on the current charge, the information charging the defendant as an habitual offender could be filed after conviction on the current charge (Stratton/ Hatt);
"(2) Failure to follow the Stratton/Hatt procedure would not preclude a prosecutor from proceeding on a supplemental information charging a defendant as an habitual offender unless
*585"(a) no good reason existed for the delay in filing the supplemental information, and
"(b) the delay substantially prejudiced the defendant’s rights (Marshall);
"(3) The need to verify information contained in a rap sheet was a good reason for delaying the filing of a supplemental information until after a defendant’s conviction on the current offense (Hendrick — majority opinion);
. "(4) Requiring a defendant to go to trial on a criminal charge, or to enter a plea of guilty, without notice that upon conviction on that charge a supplemental information would be filed increasing the severity of the possible consequences of conviction was always substantially prejudicial to that defendant (Hendrick — Levin dissent).” Martin, supra, 457.
In the instant case, the information charging defendant with the heist of the hams was filed on March 6, 1979. He was convicted on June 5, 1979, but the supplemental information was not filed until June 7, 1979. The supplemental information charged defendant with four prior felony convictions, all arising in Washtenaw County. Accordingly, the prosecution either knew, or should have known,3 of defendant’s previous convictions before his conviction on the latest offense. As such, the supplemental information should have been filed prior to conviction for that offense. Hatt, supra, Stratton, supra. No reason has ever been advanced to explain the delay, and the fact that defendant was forced to go to trial without proper notice4 of *586the subsequent supplemental information and the attendant increased sentence resulted in substantial prejudice Taylor, supra, Wilson, supra, (Bashara, J., concurring), Wallace, supra, (Bashara, J., concurring). See Hendrick, supra, 423-424 (Levin, J., dissenting). Accordingly, the supplemental information was not timely filed. Defendant’s sentence under the habitual offender statute is vacated and the original sentence of two years and eight months to four years is reinstated. See Fountain, supra, 99. We note in closing that defendant’s guilty plea did not waive the issue, as the issue amounts to a complete defense to the habitual offender proceeding which affects the state’s authority, as opposed to its capacity, to bring the defendant to trial. People v Alvin Johnson, 396 Mich 424; 240 NW2d 729 (1976) People v Hall 97 Mich App 143; 293 NW2d 742 (1980).
Reversed.
People v John David Wells (Docket No. 46721, decided December 12, 1980 [unreported]).
On several occasions this Court had held that the simultaneous filing rule is purely prospective People v Rice, 101 Mich App 1; 300 NW2d 428 (1980), People v Doran, 100 Mich App 795; 300 NW2d 415 (1980), People v Martin, 100 Mich App 447; 298 NW2d 900 (1980), People v Kildow, 99 Mich App 446; 298 NW2d 193 (1980), People v Mohead, 98 Mich App 612, 620-626; 295 NW2d 910 (1980), People v Holmes, 98 Mich App 369, 379; 295 NW2d 887 (1980), People v Heiler, 97 Mich App 636, 639-640; 296 NW2d 10 (1980). On other occasions, this Court has afforded Fountain some form of limited retroactive effect while not clearly stating whether that retroactivity involved the first or second "rules” of Fountain. People v Smith, 100 Mich App 731; 300 NW2d 388 (1980), People v Stein, 99 Mich App 781; 298 NW2d 638 (1980), People v Reese, 97 Mich App 785; 296 NW2d 172 (1980). On yet another occasion this Court has given the simultaneous filing rule limited retroactive effect. People v Taylor, 99 Mich App 613; 299 NW2d 9 (1980).
The Supreme Court has not clearly signaled its intention regarding the retroactivity of Fountain. See People v Morris, 407 Mich 885 (1979), People v Devine, 407 Mich 904 (1979), People v Brown, 407 Mich 913 (1979).
Fountain indicates that when the prior convictions were obtained by the office of the same prosecutor who handles the supplemental information, knowledge of those prior convictions is presumed. Fountain, supra, 99. It does not appear that such a presumption had been recognized prior to Fountain. This Court has, however, stated that this presumption should not be given prospective application only, but should apply to all pre-Fountain cases involving post-conviction filings. People v Wilson, 102 Mich App 626; 302 NW2d 303 (1981). In addition, we note that this case was pending on appeal when Fountain was decided, as the claim of appeal was filed August 14, 1979, and Fountain was decided August 28, 1979.
In its brief on appeal, the prosecution contends that defendant was informed of the intent to file a supplemental information at a pretrial conference. This allegation does not, however, find support in the record.