diff --git a/flake.nix b/flake.nix
index 5f8a081f..2f99caaf 100644
--- a/flake.nix
+++ b/flake.nix
@@ -69,6 +69,7 @@
         server = pkgs.python3.pkgs.callPackage ./nix/server.nix { inherit nix-filter; };
       in
       {
+        formatter = pkgs.nixfmt-rfc-style;
         devShells = with pkgs; rec {
           default = pure;
 
@@ -81,18 +82,19 @@
             ];
           };
           test = mkShell {
-            buildInputs = [
-              benchmark
-              launcher
-              router
-              server
-            ]
-            ++ (with python3.pkgs; [
-              docker
-              pytest
-              pytest-asyncio
-              syrupy
-            ]);
+            buildInputs =
+              [
+                benchmark
+                launcher
+                router
+                server
+              ]
+              ++ (with python3.pkgs; [
+                docker
+                pytest
+                pytest-asyncio
+                syrupy
+              ]);
           };
 
           impure = mkShell {