diff --git a/lass/2configs/default.nix b/lass/2configs/default.nix
index b6eb33546..e3065ba84 100644
--- a/lass/2configs/default.nix
+++ b/lass/2configs/default.nix
@@ -9,6 +9,7 @@ with config.krebs.lib;
     ../2configs/retiolum.nix
     ../2configs/nixpkgs.nix
     ../2configs/binary-cache/client.nix
+    ../2configs/gc.nix
     ./backups.nix
     {
       users.extraUsers =
diff --git a/lass/2configs/gc.nix b/lass/2configs/gc.nix
new file mode 100644
index 000000000..8762ad95e
--- /dev/null
+++ b/lass/2configs/gc.nix
@@ -0,0 +1,8 @@
+{ config, ... }:
+
+with config.krebs.lib;
+{
+  nix.gc = {
+    automatic = ! elem config.krebs.build.host.name [ "prism" "mors" ];
+  };
+}