diff --git a/devshell/flake.nix b/devshell/flake.nix
index 50e8278..e7ad047 100644
--- a/devshell/flake.nix
+++ b/devshell/flake.nix
@@ -10,14 +10,14 @@
     utils,
     devshell,
   }:
-    utils.lib.eachDefaultSystem (system: {
-      devShells.default = let
-        pkgs = import nixpkgs {
-          inherit system;
+    utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
 
-          overlays = [devshell.overlay];
-        };
-      in
-        pkgs.devshell.mkShell {packages = with pkgs; [];};
+        overlays = [devshell.overlay];
+      };
+    in {
+      devShells.default = pkgs.devshell.mkShell {packages = with pkgs; [];};
+      formatter = pkgs.alejandra;
     });
 }
diff --git a/go/flake.nix b/go/flake.nix
index 72704bd..2947f1f 100644
--- a/go/flake.nix
+++ b/go/flake.nix
@@ -34,5 +34,6 @@
 
       devShells.default =
         pkgs.devshell.mkShell {packages = with pkgs; [go gopls];};
+      formatter = pkgs.alejandra;
     });
 }
diff --git a/rust/flake.nix b/rust/flake.nix
index fb5a68f..419b247 100644
--- a/rust/flake.nix
+++ b/rust/flake.nix
@@ -45,5 +45,6 @@
         pkgs.devshell.mkShell {
           packages = with pkgs; [(rust.override {extensions = ["rls"];})];
         };
+      formatter = pkgs.alejandra;
     });
 }