diff --git a/hosts/nixos/porthos/default.nix b/hosts/nixos/porthos/default.nix
index 326d1cd..2dea899 100644
--- a/hosts/nixos/porthos/default.nix
+++ b/hosts/nixos/porthos/default.nix
@@ -9,6 +9,7 @@
     ./networking.nix
     ./secrets
     ./services.nix
+    ./system.nix
     ./users.nix
   ];
 
diff --git a/hosts/nixos/porthos/system.nix b/hosts/nixos/porthos/system.nix
new file mode 100644
index 0000000..07b9947
--- /dev/null
+++ b/hosts/nixos/porthos/system.nix
@@ -0,0 +1,12 @@
+# Core system configuration
+{ ... }:
+{
+  my.system = {
+    nix = {
+      cache = {
+        # This server is the one serving the cache, don't try to query it
+        selfHosted = false;
+      };
+    };
+  };
+}