diff --git a/machines/core/nix.nix b/machines/core/nix.nix
index d492c94..6db75a1 100644
--- a/machines/core/nix.nix
+++ b/machines/core/nix.nix
@@ -38,6 +38,7 @@
     nix-index
     nix-prefetch
     nix-update
+    nixfmt-rfc-style
     nixpkgs-fmt
     nixpkgs-hammering
     nixpkgs-review