diff --git a/hosts/mail-1/configuration.nix b/hosts/mail-1/configuration.nix
deleted file mode 100644
index 80c5b38..0000000
--- a/hosts/mail-1/configuration.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{ ... }:
-
-{
-  networking.hostName = "mail-1";
-
-  clerie.monitoring = {
-    enable = true;
-    id = "208";
-    pubkey = "s2GT9iYQmuiwkZ04KzSqqlIEbUJ6CT6i4htCjWYt2xs=";
-    nixos = false;
-  };
-}
diff --git a/hosts/monitoring-3/prometheus.nix b/hosts/monitoring-3/prometheus.nix
index 15a1f1a..0b19c5d 100644
--- a/hosts/monitoring-3/prometheus.nix
+++ b/hosts/monitoring-3/prometheus.nix
@@ -3,7 +3,17 @@
 with lib;
 
 let
-  hosts = _nixfiles.nixosConfigurations;
+  hosts = _nixfiles.nixosConfigurations // {
+    "mail-1".config = {
+      networking.hostName = "mail-1";
+      clerie.monitoring = {
+        enable = true;
+        id = "208";
+        pubkey = "s2GT9iYQmuiwkZ04KzSqqlIEbUJ6CT6i4htCjWYt2xs=";
+        nixos = false;
+      };
+    };
+  };
 
   monitoringHosts = filterAttrs (name: host:
     attrByPath ["clerie" "monitoring" "enable"] false host.config)