diff --git a/etcnixos/flake.nix b/etcnixos/flake.nix
index e890630..fc5b090 100644
--- a/etcnixos/flake.nix
+++ b/etcnixos/flake.nix
@@ -45,6 +45,7 @@
       ];
     in
     {
+      formatter.${system} = nixpkgs.legacyPackages.${system}.nixfmt-rfc-style;
       nixosConfigurations = nixpkgs.lib.foldl' (
         config: hostname:
         config
diff --git a/home-manager/flake.nix b/home-manager/flake.nix
index d70bbb4..7425912 100644
--- a/home-manager/flake.nix
+++ b/home-manager/flake.nix
@@ -64,6 +64,7 @@
       pkgs = (import nixpkgs { });
     in
     {
+      formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt-rfc-style;
       homeConfigurations."${username}" = home-manager.lib.homeManagerConfiguration {
         inherit pkgs;
         extraSpecialArgs = {