diff --git a/pkgs/development/python-modules/pyvmomi/default.nix b/pkgs/development/python-modules/pyvmomi/default.nix
index 8f8ca6f1d7ac..b6a775327f42 100644
--- a/pkgs/development/python-modules/pyvmomi/default.nix
+++ b/pkgs/development/python-modules/pyvmomi/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchFromGitHub, requests }:
+{ lib, buildPythonPackage, fetchFromGitHub, requests, six }:
 
 buildPythonPackage rec {
   pname = "pyvmomi";
@@ -14,7 +14,7 @@ buildPythonPackage rec {
   # requires old version of vcrpy
   doCheck = false;
 
-  propagatedBuildInputs = [ requests ];
+  propagatedBuildInputs = [ requests six ];
 
   meta = with lib; {
     description = "Python SDK for the VMware vSphere API that allows you to manage ESX, ESXi, and vCenter";