Doctor Javier Garcia appeals his convictions for three conspiracy crimes. Garcia argues that the district court erred when it permitted the government to impeach Garcia’s co-defendant Junior Rafael Corrales with Corrales’s convictions regarding the same conspiracy that was the basis of the charges against Garcia. We affirm.

WRen the government cross-examined Corrales about his convictions, Garcia ob *905 jected that the subject was “beyond the scope” of his direct examination. Garcia now argues that the district court undermined his mistake-of-fact defense when it allowed the government to impeach Cor-rales with his conspiracy convictions. Garcia’s failure to raise this argument in the district court bars relief unless Garcia establishes a plain error that “seriously jeopardized [his] substantial rights.” United States v. King, 505 F.2d 602, 605 (5th Cir. 1974).

The district court did not plainly err by permitting the government to question Corrales about his convictions. Evidence of the convictions allowed the jury to assess fairly Corrales’s testimony and corrected the impression that Corrales was acting as a confidential informant and was not a participant in the conspiracy. See United States v. DeLoach, 34 F.3d 1001, 1004 (11th Cir. 1994). Although the court did not instruct the jury about the limited use of the convictions, “the absence of a cautionary instruction alone does not warrant a conclusion of plain error.” King, 505 F.2d at 607. The government briefly inquired into Corrales’s convictions to establish that Corrales’s actions were not sanctioned by the government, and the government did not insinuate that Cor-rales’s guilt incriminated Garcia. See King, 505 F.2d at 609 (citing United States v. Rothman, 463 F.2d 488, 490 (2d Cir. 1972)); DeLoach, 34 F.3d at 1004. The evidence did not preclude Garcia from presenting his mistake-of-fact defense that he believed he was acting in concert with Corrales to build a drug trafficking case for the Drug Enforcement Agency. See King, 505 F.2d at 609.

Garcia’s convictions are AFFIRMED.