diff --git a/pkgs/tools/graphics/graphviz/default.nix b/pkgs/tools/graphics/graphviz/default.nix
index 9bc51c2183b0..bcd13cfff089 100644
--- a/pkgs/tools/graphics/graphviz/default.nix
+++ b/pkgs/tools/graphics/graphviz/default.nix
@@ -1,31 +1,32 @@
-{ lib
-, stdenv
-, fetchFromGitLab
-, autoreconfHook
-, pkg-config
-, cairo
-, expat
-, flex
-, fontconfig
-, gd
-, gts
-, libjpeg
-, libpng
-, libtool
-, makeWrapper
-, pango
-, bash
-, bison
-, xorg
-, ApplicationServices
-, Foundation
-, python3
-, withXorg ? true
+{
+  lib,
+  stdenv,
+  fetchFromGitLab,
+  autoreconfHook,
+  pkg-config,
+  cairo,
+  expat,
+  flex,
+  fontconfig,
+  gd,
+  gts,
+  libjpeg,
+  libpng,
+  libtool,
+  makeWrapper,
+  pango,
+  bash,
+  bison,
+  xorg,
+  ApplicationServices,
+  Foundation,
+  python3,
+  withXorg ? true,
 
-# for passthru.tests
-, exiv2
-, fltk
-, graphicsmagick
+  # for passthru.tests
+  exiv2,
+  fltk,
+  graphicsmagick,
 }:
 
 let
@@ -51,17 +52,22 @@ stdenv.mkDerivation rec {
     flex
   ];
 
-  buildInputs = [
-    libpng
-    libjpeg
-    expat
-    fontconfig
-    gd
-    gts
-    pango
-    bash
-  ] ++ optionals withXorg (with xorg; [ libXrender ])
-  ++ optionals stdenv.hostPlatform.isDarwin [ ApplicationServices Foundation ];
+  buildInputs =
+    [
+      libpng
+      libjpeg
+      expat
+      fontconfig
+      gd
+      gts
+      pango
+      bash
+    ]
+    ++ optionals withXorg (with xorg; [ libXrender ])
+    ++ optionals stdenv.hostPlatform.isDarwin [
+      ApplicationServices
+      Foundation
+    ];
 
   hardeningDisable = [ "fortify" ];
 
@@ -72,8 +78,7 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  CPPFLAGS = optionalString (withXorg && stdenv.hostPlatform.isDarwin)
-    "-I${cairo.dev}/include/cairo";
+  CPPFLAGS = optionalString (withXorg && stdenv.hostPlatform.isDarwin) "-I${cairo.dev}/include/cairo";
 
   doCheck = false; # fails with "Graphviz test suite requires ksh93" which is not in nixpkgs
 
@@ -96,12 +101,12 @@ stdenv.mkDerivation rec {
       pydot
       pygraphviz
       xdot
-    ;
+      ;
     inherit
       exiv2
       fltk
       graphicsmagick
-    ;
+      ;
   };
 
   meta = with lib; {
@@ -109,6 +114,9 @@ stdenv.mkDerivation rec {
     description = "Graph visualization tools";
     license = licenses.epl10;
     platforms = platforms.unix;
-    maintainers = with maintainers; [ bjornfor raskin ];
+    maintainers = with maintainers; [
+      bjornfor
+      raskin
+    ];
   };
 }