diff --git a/pkgs/development/python-modules/docloud/default.nix b/pkgs/development/python-modules/docloud/default.nix
index f1ec269f7cbb..2c92b32c748c 100644
--- a/pkgs/development/python-modules/docloud/default.nix
+++ b/pkgs/development/python-modules/docloud/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , requests
+, six
 }:
 
 buildPythonPackage rec {
@@ -15,6 +16,7 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     requests
+    six
   ];
 
   # Pypi's tarball doesn't contain tests. Source not available.