diff --git a/flake.nix b/flake.nix
index b22cf56a9b5f7..c09a81e7248c4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -92,6 +92,9 @@
         })
       );
 
+      # Allows the RFC 166 formatter to be run by just using nix fmt.
+      formatter = forAllSystems (system: self.legacyPackages.${system}.nixfmt-rfc-style);
+
       nixosModules = {
         notDetected = ./nixos/modules/installer/scan/not-detected.nix;