diff --git a/pkgs/applications/misc/nut/2.6.3.nix b/pkgs/applications/misc/nut/2.6.3.nix
deleted file mode 100644
index 471529675dbf..000000000000
--- a/pkgs/applications/misc/nut/2.6.3.nix
+++ /dev/null
@@ -1,34 +0,0 @@
-{ stdenv, fetchurl, pkgconfig, neon, libusb, openssl, udev, avahi, freeipmi }:
-
-stdenv.mkDerivation {
-  name = "nut-2.6.3";
-  src = fetchurl {
-    url = http://www.networkupstools.org/source/2.6/nut-2.6.3.tar.gz;
-    sha256 = "0fk3bcivv26kw1psxb6sykqp9n5w02j01s1idypzlci0kmr3p49l";
-  };
-
-  buildInputs = [ neon libusb openssl udev avahi freeipmi ];
-  buildNativeInputs = [ pkgconfig ];
-
-  configureFlags = [
-    "--with-all"
-    "--with-ssl"
-    "--without-snmp" # Until we have it ...
-    "--without-powerman" # Until we have it ...
-    "--without-cgi"
-    "--without-hal"
-  ];
-
-  meta = {
-    description = "Network UPS Tools";
-    longDescription = ''
-      Network UPS Tools is a collection of programs which provide a common
-      interface for monitoring and administering UPS, PDU and SCD hardware.
-      It uses a layered approach to connect all of the parts.
-    '';
-    homepage = http://www.networkupstools.org/;
-    platforms = with stdenv.lib.platforms; linux;
-    maintainers = with stdenv.lib.maintainers; [ pierron ];
-    priority = 10;
-  };
-}
diff --git a/pkgs/applications/misc/nut/default.nix b/pkgs/applications/misc/nut/default.nix
index 51ae8633a7c0..b89a35d2f814 100644
--- a/pkgs/applications/misc/nut/default.nix
+++ b/pkgs/applications/misc/nut/default.nix
@@ -1,21 +1,28 @@
-{ stdenv, fetchurl, pkgconfig, neon, libusb, openssl, udev }:
+{ stdenv, fetchurl, pkgconfig, neon, libusb, openssl, udev, avahi, freeipmi }:
 
-stdenv.mkDerivation {
-  name = "nut-2.6.1";
+stdenv.mkDerivation rec {
+  name = "nut-2.6.5";
 
   src = fetchurl {
-    url = http://www.networkupstools.org/source/2.6/nut-2.6.1.tar.gz;
-    sha256 = "f5c46b856c0cf5b7f0e4b22d82b670af64cc98717a90eaac8723dd402a181c00";
+    url = "http://www.networkupstools.org/source/2.6/${name}.tar.gz";
+    sha256 = "0gxrzsblx0jc4g9w0903ybwqbv1d79vq5hnks403fvnay4fgg3b1";
   };
 
-  buildInputs = [ pkgconfig neon libusb openssl udev ];
+  buildInputs = [ neon libusb openssl udev avahi freeipmi ];
 
-  configureFlags = [
-    "--with-all"
-    "--without-snmp" # Until we have it ...
-    "--without-powerman" # Until we have it ...
-    "--without-cgi"
-  ];
+  buildNativeInputs = [ pkgconfig ];
+
+  configureFlags =
+    [ "--with-all"
+      "--with-ssl"
+      "--without-snmp" # Until we have it ...
+      "--without-powerman" # Until we have it ...
+      "--without-cgi"
+      "--without-hal"
+      "--with-systemdsystemunitdir=$(out)/etc/systemd/systemd"
+    ];
+
+  enableParallelBuilding = true;
 
   meta = {
     description = "Network UPS Tools";
@@ -27,5 +34,6 @@ stdenv.mkDerivation {
     homepage = http://www.networkupstools.org/;
     platforms = with stdenv.lib.platforms; linux;
     maintainers = with stdenv.lib.maintainers; [ pierron ];
+    priority = 10;
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d1941780ebc7..c8fdc0653285 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8886,8 +8886,6 @@ let
 
   nut = callPackage ../applications/misc/nut { };
 
-  nut_2_6_3 = callPackage ../applications/misc/nut/2.6.3.nix { };
-
   disnix = callPackage ../tools/package-management/disnix { };
 
   disnix_activation_scripts = callPackage ../tools/package-management/disnix/activation-scripts {