diff --git a/configuration.nix b/configuration.nix
index 99866bf..b2f0fc4 100755
--- a/configuration.nix
+++ b/configuration.nix
@@ -9,6 +9,7 @@
     ./system-modules/sound.nix
     ./system-modules/fonts.nix
     ./system-modules/boot.nix
+    ./system-modules/gc.nix
     ./system-modules/dm.nix
     ./system-modules/networking.nix
     ./system-modules/virtualisation.nix
diff --git a/system-modules/gc.nix b/system-modules/gc.nix
new file mode 100644
index 0000000..2ddd4cd
--- /dev/null
+++ b/system-modules/gc.nix
@@ -0,0 +1,11 @@
+{ ... }:
+{
+	nix = {
+		gc = {
+			automatic = true;
+	  	dates = "weekly";
+	  	options = "--delete-older-than 30d";
+		};
+		settings.auto-optimise-store = true;
+	};
+}