diff --git a/configuration/services/backups.nix b/configuration/services/backups.nix
index 44e94d2..3635a83 100644
--- a/configuration/services/backups.nix
+++ b/configuration/services/backups.nix
@@ -123,6 +123,7 @@ in {
           environment = {
             RESTIC_PASSWORD_FILE = config.sops.secrets."restic/local-backups".path;
             RESTIC_REPOSITORY = "/var/lib/backups/";
+            RESTIC_CACHE_DIR = "%C/restic-prune";
           };
 
           path = with pkgs; [