Per Curiam.
Clyde Timothy Bunkley petitions for a writ of certiorari, arguing that the Florida Supreme Court contradicted the principles of this Court’s decision in Fiore v. White, 531 U. S. 225 (2001) (per curiam), when it failed to determine whether the “common pocketknife” exception to Florida’s definition of a ‘“[w]eapon’” encompassed Bunkley’s pocketknife at the time that his conviction became final in 1989. Fla. Stat. §790.001(13) (2000). We agree, and therefore grant Bunkley’s motion to proceed in forma pauperis and his petition for a writ of certiorari.
1=1
In the early morning hours of April 16,1986, Bunkley burglarized a closed, unoccupied Western Sizzlin’ Restaurant. Report and Recommendation in No. 91-113-CIV-T-99(B) (MD Fla.), p. 1. The police arrested him after he left the restaurant. At the time of his arrest, the police discovered a “pocketknife, with a blade of 2V¿ to 3 inches in length, . . . folded and in his pocket.” 768 So. 2d 510 (Fla. App. 2000) (per curiam). “There is no evidence indicating Bunkley ever used the pocketknife during the burglary, nor that he threatened anyone with the pocketknife at any time.” Ibid.
Bunkley was charged with burglary in the first degree because he was armed with a “dangerous weapon” — namely, the pocketknife. Fla. Stat. § 810.02(2)(b) (2000). The punishment for burglary in the first degree is “imprisonment for a term of years not exceeding life imprisonment.” §810.02(2). If the pocketknife had not been classified as a “dangerous weapon,” Bunkley would have been charged with burglary in the third degree. See 833 So. 2d 739, 742 (Fla. 2002). Burglary in the third degree is punishable “by a term of imprisonment not exceeding 5 years.” Fla. Stat. § 775.082(3)(d) (2002); see also 833 So. 2d, at 742. Bunkley was convicted of burglary in the first degree. He was sentenced to life imprisonment. In 1989, a Florida appellate court affirmed Bunkley’s conviction and sentence. See 539 So. 2d 477.
Florida law defines a “ ‘[wjeapon’ ” to “mea[n] any dirk, metallic knuckles, slingshot, billie, tear gas gun, chemical weapon or device, or other deadly weapon except a firearm or a common pocketknife.” §790.001(13). Florida has excepted the “ ‘common pocketknife’ ” from its weapons statute since 1901, and the relevant language has remained unchanged since that time. See 833 So. 2d, at 743.
In 1997, the Florida Supreme Court interpreted the meaning of the “common pocketknife” exception for the first time. In L. B. v. State, 700 So. 2d 370, 373 (per curiam), the court determined that a pocketknife with a blade of 3% inches “plainly falls within the statutory exception to the definition of ‘weapon’ found in section 790.001(13).” The complete analysis of the Florida Supreme Court on this issue was as follows: “In 1951, the Attorney General of Florida opined that a pocketknife with a blade of four inches in length or less was a ‘common pocketknife.’ The knife appellant carried, which had a 3%-inch blade, clearly fell within this range.” Ibid, (citation omitted). The Florida Supreme Court accordingly vacated the conviction in L. B. because the “knife in question was a ‘common pocketknife’ under any intended definition of that term.” Ibid. Justice Grimes, joined by Justice Wells, wrote an opinion agreeing with the majority’s resolution of the case “[i]n view of the Attorney General’s opinion and the absence of a more definitive description of a common pocketknife.” Ibid.
After the Florida Supreme Court issued its decision in L. B., Bunkley filed a motion for postconviction relief under Florida Rule of Criminal Procedure 3.850 (1999). Bunkley alleged that under the L. B. decision, his pocketknife could not have been considered a “weapon” under §790.001(13). He therefore argued that his conviction for armed burglary was invalid and should be vacated because a “common pocketknife can not [sic] support a conviction involving possession of a weapon.” App. to Pet. for Cert. C-2. The Circuit Court rejected Bunkley’s motion, and the District Court of Appeal of Florida, Second District, affirmed. 768 So. 2d 510 (2000).
The Florida Supreme Court also rejected Bunkley’s claim. It held that the L. B. decision did not apply retroactively. Under Florida law, only “jurisprudential upheavals” will be applied retroactively. 833 So. 2d, at 743 (internal quotation marks omitted). The court stated that a “jurisprudential upheaval is a major constitutional change of law.” Id., at 745 (internal quotation marks omitted). By contrast, any “evolutionary refinements” in the law “are not applied retroactively.” Id., at 744. The court then held that L. B. was an evolutionary refinement in the law, and therefore Bunkley was not entitled to relief. In a footnote, the Florida Supreme Court cited our decision in Fiore v. White, supra, and held without analysis that Fiore did not apply to this case. See 833 So. 2d, at 744, n. 12.
Justice Pariente, joined by Chief Justice Anstead, dissented. She stated that the Florida Supreme Court’s decision in L. B. “should be applied to grant Bunkley collateral relief.” 833 So. 2d, at 746. She criticized the majority opinion for relying solely on a retroactivity question. In her view, “application of the due process principles of Fiore renders a retroactivity analysis . . . unnecessary.” Id., at 747. She noted that even if .L. B. was merely an evolutionary refinement of the law, “the majority offers no precedent laying out the stages of this evolution.” 833 So. 2d, at 747. Because she thought the L. B. decision “correctly stated the law at the time Bunkley’s conviction became final,” she would have vacated Bunkley’s conviction. 833 So. 2d, at 747.
II
Fiore v. White involved a Pennsylvania criminal statute that the Pennsylvania Supreme Court interpreted for the first time after the defendant Fiore’s conviction became final. See 531 U. S., at 226. Under the Pennsylvania Supreme Court’s interpretation of the criminal statute, Fiore could not have been guilty of the crime for which he was convicted. See id., at 227-228. We originally granted certiorari in Fiore to consider “when, or whether, the Federal Due Process Clause requires a State to apply a new interpretation of a state criminal statute retroactively to cases on collateral review.” Id., at 226. “Because we were uncertain whether the Pennsylvania Supreme Court’s decision . .. represented a change in the law,” we certified a question to the Pennsylvania Supreme Court. Id., at 228. This question asked whether the Pennsylvania Supreme Court’s interpretation of the statute “ ‘state [d] the correct interpretation of the law of Pennsylvania at the date Fiore’s conviction became final.’” Ibid.
When the Pennsylvania Supreme Court replied that the ruling “ ‘merely clarified the plain language of the statute/ ” ibid., the question on which we originally granted certiorari disappeared. Pennsylvania’s answer revealed the “simple, inevitable conclusion” that Fiore’s conviction violated due process. Id., at 229. It has long been established by this Court that “the Due Process Clause . . . forbids a State to convict a person of a crime without proving the elements of that crime beyond a reasonable doubt.” Id., at 228-229. Because Pennsylvania law — as interpreted by the later State Supreme Court decision — made clear that Fiore’s conduct did not violate an element of the statute, his conviction did not satisfy the strictures of the Due Process Clause. Consequently, “retroactivity [was] not at issue.” Id., at 226.
Fiore controls the result here. As Justice Pariente stated in dissent, “application of the due process principles of Fiore” may render a retroactivity analysis “unnecessary.” 833 So. 2d, at 747. The question here is not just one of retro-activity. Rather, as Fiore holds, “retroactivity is not at issue” if the Florida Supreme Court’s interpretation of the “common pocketknife” exception in L. B. is “a correct statement of the law when [Bunkley’s] conviction became final.” 531 U. S., at 226. The proper question under Fiore is not whether the law has changed. Rather, Fiore requires that the Florida Supreme Court answer whether, in light of L. B., Bunkley’s pocketknife of 2Vz to 3 inches fit within § 790.001(13)’s “common pocketknife” exception at the time his conviction became final.
Although the Florida Supreme Court has determined that the L. B. decision was merely an “evolutionary refinement” in the meaning of the “common pocketknife” exception, it has not answered whether the law in 1989 defined Bunkley’s 2Vi-to 3-inch pocketknife as a “weapon” under § 790.001(13). Although the L. B. decision might have “culminat[ed].. . [the] century-long evolutionary process,” the question remains about what § 790.001(13) meant in 1989. 833 So. 2d, at 745. If Bunkley’s pocketknife fit within the “common pocketknife” exception to §790.001(13) in 1989, then Bunkley was convicted of a crime for which he cannot be guilty — burglary in the first degree. And if the “stages” of § 790.001(13)’s “evolution” had not sufficiently progressed so that Bunkley’s pocketknife was still a weapon in 1989, this case raises the issue left open in Fiore.
It is true that the Florida Supreme Court held Fiore inapplicable because the L. B. decision was a change in the law which “culminat[ed] [the] century-long evolutionary process.” 833 So. 2d, at 745. As the dissent acknowledges, however, see post, at 843, n. 1, the Florida Supreme Court’s decision in L. B. cast doubt on the validity of Bunkley’s conviction. For the first time, the Florida Supreme Court interpreted the common pocketknife exception, and its interpretation covered the weapon Bunkley possessed at the time of his offense. In the face of such doubt, Fiore entitles Bunkley to a determination as to whether L. B. correctly stated the common pocketknife exception at the time he was convicted. Ordinarily, the Florida Supreme Court’s holding that L. B. constitutes a change in — rather than a clarification of — the law would be sufficient to dispose of the Fiore question. By holding that a change in the law occurred, the Florida Supreme Court would thereby likewise have signaled that the common pocketknife exception was narrower at the time Bunkley was convicted.
Here, however, the Florida Supreme Court said more. It characterized L. B. as part of the “century-long evolutionary process.” 833 So. 2d, at 745. Because Florida law was in a state of evolution over the course of these many years, we do not know what stage in the evolutionary process the law had reached at the time Bunkley was convicted. The Florida Supreme Court never asked whether the weapons statute had “evolved” by 1989 to such an extent that Bunkley’s 2Vz- to 3-inch pocketknife fit within the “common pocketknife” exception. The proper question under Fiore is not just whether the law changed. Rather, it is when the law changed. The Florida Supreme Court has not answered this question; instead, it appeared to assume that merely labeling L. B. as the “culmination” in the common pocketknife exception’s “century-long evolutionary process” was sufficient to resolve the Fiore question. 833 So. 2d, at 745. It is not. Without further clarification from the Florida Supreme Court as to the content of the common pocketknife exception in 1989, we cannot know whether L. B. correctly stated the common pocketknife exception at the time he was convicted.
On remand, the Florida Supreme Court should consider whether, in light of the L. B. decision, Bunkley’s pocketknife of m to 3 inches fit within § 790.001(13)’s “common pocketknife” exception at the time his conviction became final. The judgment of the Supreme Court of Florida, accordingly, is vacated, and the case is remanded for further proceedings not inconsistent with this opinion.
It is so ordered.
The dissent claims that the Florida Supreme Court did not need to decide anything other than whether L. B. was a change in the law. See ;post, at 845 (citing Fla. Rule Crim. Proc. 3.850(b)(2) (2000)). Yet as the dissent concedes, see post, at 843, the Florida Supreme Court passed upon the Fiore due process inquiry as well as the retroactivity question. The dissent also notes that Bunkley has raised the issue of the common pocketknife in prior appeals. These appeals, however, were filed prior to the Florida Supreme Court’s opinion in L. B. And we agree with the dissent that absent the L. B. decision, Bunkley would not be able to pursue his claim now. The Florida Supreme Court committed an error of law here by not addressing whether the L. B. decision means that at the time Bunk-ley was convicted, he was convicted of a crime — armed burglary — for which he may not be guilty. Therefore, Michigan v. Long, 468 U. S. 1032 (1983), has no applicability here.