diff --git a/pkgs/development/python-modules/twiggy/default.nix b/pkgs/development/python-modules/twiggy/default.nix
index 01cd945fdc40..fdff4a90f9e1 100644
--- a/pkgs/development/python-modules/twiggy/default.nix
+++ b/pkgs/development/python-modules/twiggy/default.nix
@@ -1,6 +1,7 @@
 { stdenv
 , buildPythonPackage
 , fetchPypi
+, six
 }:
 
 buildPythonPackage rec {
@@ -12,6 +13,7 @@ buildPythonPackage rec {
     sha256 = "259ae96cb22e80c49e75c37dc2f7497028c5dc19018958f05fa00ec08fc2569f";
   };
 
+  propagatedBuildInputs = [ six ];
   doCheck = false;
 
   meta = with stdenv.lib; {