diff --git a/ops/nixos/lib/common.nix b/ops/nixos/lib/common.nix
index 5af5758521..a5de702953 100644
--- a/ops/nixos/lib/common.nix
+++ b/ops/nixos/lib/common.nix
@@ -127,6 +127,7 @@ in
     nix.gc = {
       automatic = lib.mkDefault true;
       dates = "*-*-* 05:00:00";
+      options = "--delete-older-than 7d";
     };
 
     home-manager.useUserPackages = true;