Arkansas inmate Bertha Mae McBride brought a 42 U.S.C. § 1983 action against administrative review officer Rose Higgins. McBride alleged that, after she filed a grievance complaining about continued harassment by two officers, Higgins issued her a “major disciplinary” for using the grievance process. The disciplinary resulted in a classification reduction, thirty days in segregation, and the loss of good-time credit. McBride sought punitive damages and restoration of her good-time credit and class. Prior to service, the district court 1 dismissed her complaint without prejudice. McBride appeals.

The district court properly dismissed McBride’s action after concluding that her claim was foreclosed by Heck v. Humphrey, 512 U.S. 477, 114 S.Ct. 2364, 129 L.Ed.2d 383 (1994) (to recover damages for unconstitutional conviction or imprisonment, or for harm from actions whose unlawfulness would render conviction or sentence invalid, § 1983 plaintiff must prove conviction or sentence has been reversed, expunged, declared invalid, or called into question), because she challenged discipline that included the loss of good-time credit, and a judgment in her favor would necessarily imply the invalidity of her disciplinary conviction. See Edwards v. Balisok, 520 U.S. 641, 644-48, 117 S.Ct. 1584, 137 L.Ed.2d 906 (1997) (extending Heck to prison discipline decisions).

Accordingly, we affirm the judgment of the district court. See 8th Cir. R. 47A(a).