diff --git a/config/common/configuration/nix.nix b/config/common/configuration/nix.nix
new file mode 100644
index 0000000..8540329
--- /dev/null
+++ b/config/common/configuration/nix.nix
@@ -0,0 +1,12 @@
+{ ... }:
+
+# Configuration options for the nix package manager
+{
+	nix.gc = {
+		# Run garbage collection automatically
+		automatic = true;
+		# Run it once a week
+		dates = "weekly";
+		options = "--delete-older-than 30d";
+	};
+}
diff --git a/config/hosts/grondahl/configuration.nix b/config/hosts/grondahl/configuration.nix
index d260eca..1545408 100644
--- a/config/hosts/grondahl/configuration.nix
+++ b/config/hosts/grondahl/configuration.nix
@@ -5,6 +5,7 @@
     [ # Include the results of the hardware scan.
     ./hardware-configuration.nix
     ./data/secrets/secrets.nix
+    ../../common/configuration/nix.nix
     ../../common/services/ssh.nix
     ../../common/services/tailscale.nix
     ../../common/users.nix
diff --git a/config/hosts/rudiger/configuration.nix b/config/hosts/rudiger/configuration.nix
index ba07653..212a48c 100644
--- a/config/hosts/rudiger/configuration.nix
+++ b/config/hosts/rudiger/configuration.nix
@@ -5,6 +5,7 @@
     [
       ./hardware-configuration.nix
       ./data/secrets/secrets.nix
+      ../../common/configuration/nix.nix
       ../../common/services/ssh.nix
       ../../common/services/tailscale.nix
       ../../common/users.nix
diff --git a/config/hosts/wind/configuration.nix b/config/hosts/wind/configuration.nix
index bb597df..01ce383 100644
--- a/config/hosts/wind/configuration.nix
+++ b/config/hosts/wind/configuration.nix
@@ -3,6 +3,7 @@
 {
 	imports = [
 		./hardware-configuration.nix
+		../../common/configuration/nix.nix
 		../../common/services/ssh.nix
 		../../common/services/tailscale.nix
 		../../common/users.nix