diff --git a/modules/base/darwin.nix b/modules/base/darwin.nix
index 07be0a6..fb2f2b0 100644
--- a/modules/base/darwin.nix
+++ b/modules/base/darwin.nix
@@ -15,6 +15,7 @@
         Minute = 16;
         Weekday = 6;
       };
+      options = "--delete-older-than 30d";
     };
     settings = {
       trusted-users = [ "root" "@admin" ];
diff --git a/modules/base/default.nix b/modules/base/default.nix
index 3cd3812..72cf53d 100644
--- a/modules/base/default.nix
+++ b/modules/base/default.nix
@@ -11,6 +11,7 @@
     gc = {
       persistent = true;
       dates = "weekly";
+      options = "--delete-older-than 30d";
     };
 
     settings = {