diff --git a/keys/default.nix b/keys/default.nix
index 1870309..a22d413 100644
--- a/keys/default.nix
+++ b/keys/default.nix
@@ -81,7 +81,14 @@ rec {
     ];
   };
 
+  _builder_keys = {
+    raito = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIA3hCOyFwuoCLt5W9e9yQSwj9I+VspB0kNNHsoFngbgZ Nix remote builder key"
+    ];
+  };
+
   getKeys = ls: builtins.concatLists (builtins.map (member: _keys.${member} or [ ]) ls);
+  getBuilderKeys = member: _builder_keys.${member} or [ ];
 
   mkSecrets =
     nodes: setDefault { publicKeys = unique (rootKeys ++ (builtins.concatMap getNodeKeys' nodes)); };