diff --git a/pkgs/lumpy.nix b/pkgs/lumpy.nix
index 86758bb..cf2eb3d 100644
--- a/pkgs/lumpy.nix
+++ b/pkgs/lumpy.nix
@@ -1,12 +1,14 @@
 { stdenv, lib, fetchFromGitHub, which, autoconf, automake
 , zlib, curl
-, python2, hexdump, sambamba, samblaster, samtools }: let
+, python2, fetchPypi, hexdump, sambamba, samblaster, samtools }: let
   python = python2.override {
     packageOverrides = final: prev: {
       numpy = prev.numpy.overridePythonAttrs(old: rec {
         version = "1.16.6";
+        disabled = false;
         src = fetchPypi {
-          inherit pname version;
+          inherit version;
+          pname = "numpy";
           extension = "zip";
           sha256 = "e5cf3fdf13401885e8eea8170624ec96225e2174eb0c611c6f26dd33b489e3ff";
         };