diff --git a/default.nix b/default.nix
index 811bdc7..abfcda4 100644
--- a/default.nix
+++ b/default.nix
@@ -12,17 +12,22 @@
 
 let
   filterMesonBuild = dir: builtins.filterSource
-    (path: type: type != "directory" || baseNameOf path != "build") dir;
+    (path: type: type != "directory" || baseNameOf path != "build")
+    dir;
 in
 stdenv.mkDerivation rec {
   pname = "nix-eval-jobs";
   version = "0.0.1";
   src = if srcDir == null then filterMesonBuild ./. else srcDir;
   buildInputs = [
-    nlohmann_json nixFlakes boost
+    nlohmann_json
+    nixFlakes
+    boost
   ];
   nativeBuildInputs = [
-    meson pkg-config ninja
+    meson
+    pkg-config
+    ninja
     # nlohmann_json can be only discovered via cmake files
     cmake
   ];
diff --git a/flake.nix b/flake.nix
index 5ba3877..6e4dd50 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,15 +15,26 @@
 
         checks = {
 
-          editorconfig = pkgs.runCommand "editorconfig-checks" {
-            nativeBuildInputs = [
-              pkgs.editorconfig-checker
-            ];
-          } ''
+          editorconfig = pkgs.runCommand "editorconfig-check"
+            {
+              nativeBuildInputs = [
+                pkgs.editorconfig-checker
+              ];
+            } ''
             editorconfig-checker ${self}
             touch $out
           '';
 
+          nixpkgs-fmt = pkgs.runCommand "fmt-check"
+            {
+              nativeBuildInputs = [
+                pkgs.nixpkgs-fmt
+              ];
+            } ''
+            nixpkgs-fmt --check .
+            touch $out
+          '';
+
           build = packages.nix-eval-jobs;
 
         };
@@ -31,5 +42,6 @@
         defaultPackage = self.packages.${system}.nix-eval-jobs;
         devShell = pkgs.callPackage ./shell.nix drvArgs;
 
-      });
+      }
+    );
 }
diff --git a/shell.nix b/shell.nix
index 736a1c3..7b97e75 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,13 +2,15 @@
 , srcDir ? null
 }:
 
-(pkgs.callPackage ./default.nix { inherit srcDir; }).overrideAttrs(old: {
+(pkgs.callPackage ./default.nix { inherit srcDir; }).overrideAttrs (old: {
 
   nativeBuildInputs = old.nativeBuildInputs ++ [
 
     pkgs.editorconfig-checker
 
-    (pkgs.python3.withPackages(ps: [
+    pkgs.nixpkgs-fmt
+
+    (pkgs.python3.withPackages (ps: [
       ps.pytest
     ]))
 
diff --git a/tests/assets/ci.nix b/tests/assets/ci.nix
index 48bf177..3aa2eca 100644
--- a/tests/assets/ci.nix
+++ b/tests/assets/ci.nix
@@ -1,5 +1,5 @@
 let
-  pkgs = import (builtins.getFlake (toString ./.)).inputs.nixpkgs {};
+  pkgs = import (builtins.getFlake (toString ./.)).inputs.nixpkgs { };
 in
 {
   builtJob = pkgs.writeText "job1" "job1";
diff --git a/tests/assets/flake.nix b/tests/assets/flake.nix
index bbd81a6..c383510 100644
--- a/tests/assets/flake.nix
+++ b/tests/assets/flake.nix
@@ -1,12 +1,14 @@
 {
   inputs.nixpkgs.url = "github:NixOS/nixpkgs";
 
-  outputs = { self, nixpkgs }: let
-    pkgs = nixpkgs.legacyPackages.x86_64-linux;
-  in {
-    hydraJobs = {
-      builtJob = pkgs.writeText "job1" "job1";
-      substitutedJob = pkgs.hello;
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in
+    {
+      hydraJobs = {
+        builtJob = pkgs.writeText "job1" "job1";
+        substitutedJob = pkgs.hello;
+      };
     };
-  };
 }