Arkansas inmate Mark Conner appeals the district court’s dismissal without prejudice of his 42 U.S.C. § 1988 complaint for failure to exhaust administrative remedies. We grant Conner’s in forma pauperis motion and leave the fee collection details to the district court. See Henderson v. Norris, 129 F.3d 481, 484-85 (8th Cir. 1997) (per curiam).

Failure to exhaust administrative remedies is an affirmative defense that a defendant must plead and prove. See Jones v. Bock, 549 U.S. 199, 127 S.Ct. 910, 915, 921, 166 L.Ed.2d 798 (2007). Defendant Dr. Ifediora offered the Jefferson County Jail (JCJ) grievance policy, and the JCJ grievance officer’s declaration that there was no record of Conner’s having filed any grievance during his 2006 detention at JCJ. This evidence was insufficient to establish failure to exhaust in the face of Conner’s assertion in his verified complaint that he had filed at least two relevant grievances but did not receive copies of them or responses to them. See Hanks v. Prachar, 457 F.3d 774, 775 (8th Cir. 2006) (per curiam) (noting that verified complaint is equivalent to affidavit for summary judgment purposes); Nerness v. Johnson, 401 F.3d 874, 876 (8th Cir. 2005) (per curiam) (de novo review of district court’s application of Prison Litigation Reform Act, and clear-error review of its findings of fact); Miller v. Norris, 247 F.3d 736, 740 (8th Cir. 2001) (remedy prison officials keep inmate from using is not “available” for purposes of 42 U.S.C. § 1997e(a)); cf. Foulk v. Charrier, 262 F.3d 687, 697-98 (8th Cir. 2001) (district court lacked sufficient factual basis to find failure to exhaust where evidence at trial showed that prison officials refused to respond to inmate’s informal resolution request and thus that inmate was precluded from completing grievance process).

Accordingly, we hold that dismissal for failure to exhaust was unwarranted on the record before the district court, and we reverse and remand for further proceedings consistent with this opinion.