diff --git a/nixos/modules/services/backup/restic.nix b/nixos/modules/services/backup/restic.nix
index 333fdd494e3b..a8e7a8b70dfa 100644
--- a/nixos/modules/services/backup/restic.nix
+++ b/nixos/modules/services/backup/restic.nix
@@ -312,7 +312,7 @@ in
               ''}
             '';
           } // optionalAttrs (backup.dynamicFilesFrom != null || backup.backupCleanupCommand != null) {
-            postStart = ''
+            postStop = ''
               ${optionalString (backup.backupCleanupCommand != null) ''
                 ${pkgs.writeScript "backupCleanupCommand" backup.backupCleanupCommand}
               ''}