diff --git a/pkgs/by-name/ne/netkittftp/package.nix b/pkgs/by-name/ne/netkittftp/package.nix
index 08b549b319ff..5bbeedc323b5 100644
--- a/pkgs/by-name/ne/netkittftp/package.nix
+++ b/pkgs/by-name/ne/netkittftp/package.nix
@@ -5,17 +5,17 @@
   fetchpatch,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "netkit-tftp";
   version = "0.17";
 
   src = fetchurl {
     urls = [
-      "mirror://ubuntu/pool/universe/n/netkit-tftp/netkit-tftp_${version}.orig.tar.gz"
-      "ftp://ftp.uk.linux.org/pub/linux/Networking/netkit/netkit-tftp-${version}.tar.gz"
-      "https://ftp.cc.uoc.gr/mirrors/linux/ubuntu/packages/pool/universe/n/netkit-tftp/netkit-tftp_${version}.orig.tar.gz"
+      "mirror://ubuntu/pool/universe/n/netkit-tftp/netkit-tftp_${finalAttrs.version}.orig.tar.gz"
+      "ftp://ftp.uk.linux.org/pub/linux/Networking/netkit/netkit-tftp-${finalAttrs.version}.tar.gz"
+      "https://ftp.cc.uoc.gr/mirrors/linux/ubuntu/packages/pool/universe/n/netkit-tftp/netkit-tftp_${finalAttrs.version}.orig.tar.gz"
     ];
-    sha256 = "0kfibbjmy85r3k92cdchha78nzb6silkgn1zaq9g8qaf1l0w0hrs";
+    hash = "sha256-OkPAAQ1OYfQSVj/YN2nUZn2LjoKQNSbSHLkgX+Va0U0=";
   };
 
   patches = [
@@ -37,4 +37,4 @@ stdenv.mkDerivation rec {
     maintainers = [ ];
     platforms = with lib.platforms; linux;
   };
-}
+})