diff --git a/pkgs/development/libraries/zeromq/4.x.nix b/pkgs/development/libraries/zeromq/4.x.nix
index d8509c8fc3f4..be4bf7575868 100644
--- a/pkgs/development/libraries/zeromq/4.x.nix
+++ b/pkgs/development/libraries/zeromq/4.x.nix
@@ -1,30 +1,38 @@
-{ lib
-, stdenv
-, fetchFromGitHub
-, cmake
-, asciidoc
-, pkg-config
-, libsodium
-, enableDrafts ? false
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  pkg-config,
+  libsodium,
+  asciidoc,
+  enableDrafts ? false,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "zeromq";
   version = "4.3.5";
 
   src = fetchFromGitHub {
     owner = "zeromq";
     repo = "libzmq";
-    rev = "v${version}";
-    sha256 = "sha256-q2h5y0Asad+fGB9haO4Vg7a1ffO2JSb7czzlhmT3VmI=";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-q2h5y0Asad+fGB9haO4Vg7a1ffO2JSb7czzlhmT3VmI=";
   };
 
-  nativeBuildInputs = [ cmake asciidoc pkg-config ];
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+    asciidoc
+  ];
+
   buildInputs = [ libsodium ];
 
   doCheck = false; # fails all the tests (ctest)
 
-  cmakeFlags = lib.optional enableDrafts "-DENABLE_DRAFTS=ON";
+  cmakeFlags = [
+    (lib.cmakeBool "ENABLE_DRAFTS" enableDrafts)
+  ];
 
   postPatch = ''
     substituteInPlace CMakeLists.txt \
@@ -32,12 +40,12 @@ stdenv.mkDerivation rec {
       --replace '$'{prefix}/'$'{CMAKE_INSTALL_INCLUDEDIR} '$'{CMAKE_INSTALL_FULL_INCLUDEDIR}
   '';
 
-  meta = with lib; {
+  meta = {
     branch = "4";
     homepage = "http://www.zeromq.org";
     description = "Intelligent Transport Layer";
-    license = licenses.mpl20;
-    platforms = platforms.all;
-    maintainers = with maintainers; [ fpletz ];
+    license = lib.licenses.mpl20;
+    platforms = lib.platforms.all;
+    maintainers = with lib.maintainers; [ fpletz ];
   };
-}
+})