Arkansas state prisoner Patrick Robertson appeals the district court’s 1 adverse grant of summary judgment in his 42 U.S.C. § 1983 action against Charlotte Sumner, the records coordinator for the *549 Arkansas Department of Correction (ADC). He seeks leave to proceed in for-ma pauperis (IFP) on appeal. We grant Robertson leave to appeal IFP, and we affirm, but on different grounds than those relied on by the district court. See United States v. Siwek, 453 F.3d 1079, 1084 (8th Cir. 2006) (this court may affirm district court’s judgment on any basis supported by record). 2

Robertson’s claim for damages stemming from the alleged miscalculation of his parole-eligibility date is Heck-barred, see Heck v. Humphrey, 512 U.S. 477, 486-87, 114 S.Ct. 2364, 129 L.Ed.2d 383 (1994) (claim for damages that necessarily implies invalidity of conviction or sentence is not cognizable under § 1983 until conviction or sentence has been invalidated), and any challenge to his parole-eligibility date must be asserted in a habeas action, see Wilkinson v. Dotson, 544 U.S. 74, 81, 125 S.Ct. 1242, 161 L.Ed.2d 253 (2005) (state prisoners may use only habeas remedies when they seek to invalidate duration of confinement, either directly through injunction compelling speedier release or indirectly through judicial determination that necessarily implies unlawfulness of State’s custody); Preiser v. Rodriguez, 411 U.S. 475, 489-90, 93 S.Ct. 1827, 36 L.Ed.2d 439 (1973) (challenge to fact or duration of confinement must be through habeas corpus).

Accordingly, we affirm.