diff --git a/configuration/common/default.nix b/configuration/common/default.nix
index 0f907c0..682a5f1 100644
--- a/configuration/common/default.nix
+++ b/configuration/common/default.nix
@@ -40,7 +40,7 @@
   services.openssh.kbdInteractiveAuthentication = false;
   services.openssh.permitRootLogin = lib.mkDefault "no";
 
-  nix.gc = {
+  nix.gc = lib.mkDefault {
     automatic = true;
     dates = "weekly";
     options = "--delete-older-than 30d";
diff --git a/hosts/osmium/configuration.nix b/hosts/osmium/configuration.nix
index b84971e..b430c61 100644
--- a/hosts/osmium/configuration.nix
+++ b/hosts/osmium/configuration.nix
@@ -27,6 +27,12 @@
     git
   ];
 
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 400d";
+  };
+
   clerie.monitoring = {
     enable = true;
     id = "201";