diff --git a/flake.nix b/flake.nix
index 2086c4470..9e74b83b1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,7 +14,7 @@
         rec {
           packages.ci = pkgs.buildEnv {
             name = "ci";
-            paths = with pkgs; [ nodejs yarn ];
+            paths = with pkgs; [ nodejs yarn nixpkgs-fmt ];
           };
           devShell = pkgs.mkShell { buildInputs = [ packages.ci ]; };
         });
diff --git a/package.json b/package.json
index 7ebdbc506..00ee4a070 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "packages/*"
   ],
   "lint-staged": {
+    "*.nix": "nixpkgs-fmt",
     "*.{ts,tsx}": "eslint --cache --fix",
     "*.{md,js,json,yml,yaml,css,md}": "prettier --write"
   },