diff --git a/pkgs/tools/networking/stunnel/default.nix b/pkgs/tools/networking/stunnel/default.nix
index 244dd3bbcdc0..4be019c5fa07 100644
--- a/pkgs/tools/networking/stunnel/default.nix
+++ b/pkgs/tools/networking/stunnel/default.nix
@@ -1,9 +1,15 @@
-{ lib, stdenv, fetchurl, openssl, nixosTests }:
+{ lib, stdenv, fetchurl, openssl
+, systemdSupport ? lib.meta.availableOn stdenv.hostPlatform systemd, systemd
+, nixosTests
+}:
+
 
 stdenv.mkDerivation rec {
   pname = "stunnel";
   version = "5.67";
 
+  outputs = [ "out" "doc" "man" ];
+
   src = fetchurl {
     url    = "https://www.stunnel.org/archive/${lib.versions.major version}.x/${pname}-${version}.tar.gz";
     sha256 = "3086939ee6407516c59b0ba3fbf555338f9d52f459bcab6337c0f00e91ea8456";
@@ -11,11 +17,19 @@ stdenv.mkDerivation rec {
     # not the output of `nix-prefetch-url`
   };
 
-  buildInputs = [ openssl ];
+  enableParallelBuilding = true;
+
+  buildInputs = [
+    openssl
+  ] ++ lib.optionals systemdSupport [
+    systemd
+  ];
+
   configureFlags = [
     "--with-ssl=${openssl.dev}"
     "--sysconfdir=/etc"
     "--localstatedir=/var"
+    (lib.enableFeature systemdSupport "systemd")
   ];
 
   postInstall = ''