diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 4973346..30abe1c 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -29,6 +29,7 @@ in
   boot.supportedFilesystems = ["zfs"];
 
   services.zfs.autoScrub.enable = true;
+  services.zfs.autoScrub.interval = "monthly";
   services.zfs.autoSnapshot.enable = true;
   fileSystems."/tank" = {
     device = "tank";