diff --git a/nixos/hosts/silver/configuration.nix b/nixos/hosts/silver/configuration.nix
index c8befd8..d55500a 100644
--- a/nixos/hosts/silver/configuration.nix
+++ b/nixos/hosts/silver/configuration.nix
@@ -105,18 +105,5 @@ in {
     hostKeys = ["/persist/etc/secrets/initrd/ssh_host_ed25519_key"];
   };
 
-  # Periodically optimise & collect garbage
-  nix = {
-    gc = {
-      automatic = true;
-      dates = "daily";
-      options = "--delete-older-than 30d";
-    };
-    optimise = {
-      automatic = true;
-      dates = ["daily"];
-    };
-  };
-
   system.stateVersion = "24.05";
 }
diff --git a/nixos/modules/default.nix b/nixos/modules/default.nix
index 7d83a7d..922a65e 100644
--- a/nixos/modules/default.nix
+++ b/nixos/modules/default.nix
@@ -29,6 +29,17 @@
 
   ### Nix settings ###
   nix = {
+    # Periodically optimise & collect garbage
+    gc = {
+      automatic = true;
+      dates = "daily";
+      options = "--delete-older-than 30d";
+    };
+    optimise = {
+      automatic = true;
+      dates = ["daily"];
+    };
+
     # Make sure flakes are enabled
     settings.experimental-features = ["nix-command" "flakes"];
     extraOptions = ''