diff --git a/pkgs/all-packages.nix b/pkgs/all-packages.nix
index 71ae4d1..1776597 100644
--- a/pkgs/all-packages.nix
+++ b/pkgs/all-packages.nix
@@ -11,7 +11,7 @@ final: prev: with prev; {
 
   gsort = callPackage ./gsort { };
 
-  lumpy = callPackage ./lumpy.nix { };
+  lumpy = callPackage ./lumpy.nix { python=prev.python2; };
 
   #meraculous = callPackage ./meraculous.nix { let stdenv49 = overrideCC stdenv gcc49; in stdenv = stdenv49; boost = boost159.override { stdenv = stdenv49 }; };