PER CURIAM: Calletano Galarza-Morales, federal prisoner # 41291-177, moves for leave to proceed in forma pauperis (IFP) in his appeal from the dismissal of his civil rights complaint, filed pursuant to Bivens v. Six Unknown Named Agents of Fed. Bureau of Narcotics, 403 U.S. 388, 91 S.Ct. 1999, 29 L.Ed.2d 619 (1971). He is challenging the district court’s certification that his appeal is not taken in good faith. See Baugh v. Taylor, 117 F.3d 197, 202 (5th Cir. 1997).
Galarza-Morales’s conclusional assertions of error by the district court, without citation to the record or cogent legal argument, do not show that his appeal involves legal points arguable on their merits and that it is not frivolous. See Howard v. King, 707 F.2d 215, 220 (5th Cir. 1983). Although pro se briefs are liberally construed, Haines v. Kerner, 404 U.S. 519, 520, 92 S.Ct. 594, 30 L.Ed.2d 652 (1972), even pro se litigants must brief arguments in order to preserve them, Yohey v. Collins, 985 F.2d 222, 224-25 (5th Cir. 1993).
Because Galarza-Morales has not shown that the district court erred in decertifying his IFP status, the request for leave to proceed IFP is DENIED. See Baugh, 117 F.3d at 202. The appeal is DISMISSED. See id. at 202 & n.24; 5th Cir. R. 42.2. The district court’s dismissal of Galarza-Mor-ales’s complaint .as frivolous and this court’s dismissal of his appeal as frivolous count as strikes for purposes of 28 U.S.C. § 1915(g). See Adepegba v. Hammons, 103 F.3d 383, 388 (5th Cir. 1996).
If Galarza-Morales accumulates three strikes he will no longer be allowed to proceed IFP in any civil action or appeal filed while he is incarcerated or detained in any facility unless he is under imminent danger of serious physical injury. See § 1915(g). Pursuant to 5th Cir. R. 47.5, the court has determined that this opinion should not be published and is not precedent except under the limited circumstances set forth in 5th Cir. R. 47.5.4.