A California court convicted respondent Kenneth Roy of the robbery and first-degree murder of Archie Mannix. The State’s theory, insofar as is relevant here, was that Roy, coming to the aid of a confederate who was trying to rob Mannix, helped the confederate kill Mannix. The trial judge gave the jury an instruction that permitted it to convict Roy of first-degree murder as long as it concluded that (among other things) Roy, “with knowledge of” the confederate’s “unlawful purpose” (robbery), had helped the confederate, i. e., had “aid[ed],” “promote[d],” “encourage[d],” or “instigate[d]” by “act or advice ... the commission of” the confederate’s crime. The California Supreme Court later held in People v. Beeman, 35 Cal. 3d 547, 561, 674 P. 2d 1318, 1326 (1984), that an identical instruction was erroneous because of what it did not say, namely, that state law also required the jury to find that Roy had the “knowledge [and] intent or purpose of committing, encouraging, or facilitating” the confederate’s crime. Id., at 561, 674 P. 2d, at 1326 (emphasis added). Despite this error, the California Court of Appeal affirmed Roy’s conviction because it found the error “harmless beyond a reasonable doubt.” See Chapman v. California, 386 U. S. 18, 24 (1967). The California Supreme Court denied postconviction relief.

Subsequently Roy, pointing to the same instructional error, asked a Federal District Court to issue a writ of habeas corpus. The District Court denied the request because, in its view, the error was harmless. Indeed, the District Court wrote that no rational juror could have found that Roy knew the confederate’s purpose and helped him but also found that Roy did not intend to help him. A divided[*4] Ninth Circuit panel affirmed. Roy v. Gomez, 55 F. 3d 1483 (1995).

The Ninth Circuit later heard the case en bane and reversed the District Court. It held that the instructional error was not harmless. 81 F. 3d 863 (1996). In doing so, the majority applied a special “harmless error” standard, which it believed combined aspects of our decisions in Carella v. California, 491 U. S. 263 (1989) (per curiam), and O’Neal v. McAninch, 513 U. S. 432 (1995). The Ninth Circuit described the standard as follows:

“[T]he omission is harmless only if review of the facts found by the jury establishes that the jury necessarily found the omitted element.” 81 F. 3d, at 867 (emphasis in original).

As we understand that statement in context, it meant:

“[T]he omission [of the ‘intent’ part of the instruction] is harmless only if review of the facts found by the jury [namely, assistance and knowledge] establishes that the jury necessarily found the omitted element [namely, ‘intent’].” Ibid.

The State of California, seeking certiorari, argues that this definition of “harmless error” is far too strict and that this Court’s decisions require application of a significantly less strict “harmless error” standard in cases on collateral review. See Brecht v. Abrahamson, 507 U. S. 619 (1993); O’Neal, supra.

We believe that the State, and the dissenting judges in the Ninth Circuit, are correct about the proper standard. The Ninth Circuit majority drew its special standard primarily from a concurring opinion in Carella, supra, a case that dealt with legal presumptions. The concurrence in that case set out the views of several Justices about the proper way to determine whether an error in respect to the use of a presumption was “harmless.” Subsequent to Carella, however, this Court held that a federal court reviewing a state-court[*5] determination in a habeas corpus proceeding ordinarily should apply the “harmless error” standard that the Court had previously enunciated in Kotteakos v. United States, 328 U. S. 750 (1946), namely, “whether the error ‘had substantial and injurious effect or influence in determining the jury’s verdict.’ ” Brecht, supra, at 637 (citing Kotteakos, supra, at 776). The Court recognized that the Kotteakos standard did not apply to “‘structural defects in the constitution of the trial mechanism, which defy analysis by “harmless-error” standards,’ ” 507 U. S., at 629, but held that the Kotteakos standard did apply to habeas review of what the Court called “trial errors,” including errors in respect to which the Constitution requires state courts to apply a stricter, Chapman-type standard of “harmless error” when they review a conviction directly. 507 U. S., at 638. In O’Neal, supra, this Court added that where a judge, in a habeas proceeding, applying this standard of harmless error, “is in grave doubt as to the harmlessness of an error,” the habeas “petitioner must win.” Id., at 437.

The case before us is a case for application of the “harmless error” standard as enunciated in Brecht and O’Neal. This Court has written that “constitutional error” of the sort at issue in Carella is a “trial error,” not a “structural error,” and that it is subject to “harmless error” analysis. Arizona v. Fulminante, 499 U. S. 279, 306-307 (1991). The state courts in this case applied harmless-error analysis of the strict variety, and they found the error “harmless beyond a reasonable doubt.” Chapman, supra, at 24. The specific error at issue here — an error in the instruction that defined the crime — is, as the Ninth Circuit itself recognized, as easily characterized as a “misdescription of an element” of the crime, as it is characterized as an error of “omission.” 81 F. 3d, at 867, n. 4. No one claims that the error at issue here is of the “structural” sort that “‘def[ies] analysis by “harmless error” standards.’” Brecht, supra, at 629. The analysis advanced by the Ninth Circuit, while certainly con[*6] sistent with the concurring opinion in Carella, does not, in our view, overcome the holding of Brecht, followed in O’Neal, that for reasons related to the special function of habeas courts, those courts must review such error (error that may require strict review of the Chapman-type on direct appeal) under the Kotteakos standard. Thus, we are convinced that the “harmless error” standards enunciated in Brecht and O’Neal should apply to the “trial error” before us as enunciated in those opinions and without the Ninth Circuit’s modification.

For these reasons, we grant respondent’s motion for leave to proceed in forma pauperis and the petition for a writ of certiorari, vacate the Ninth Circuit’s determination, and remand for further proceedings consistent with this opinion.

It is so ordered.