diff --git a/pkgs/development/python-modules/gdown/default.nix b/pkgs/development/python-modules/gdown/default.nix
index 9af10727285..8195bb0d403 100644
--- a/pkgs/development/python-modules/gdown/default.nix
+++ b/pkgs/development/python-modules/gdown/default.nix
@@ -5,6 +5,7 @@
 , requests
 , tqdm
 , setuptools
+, six
 }:
 
 buildPythonApplication rec {
@@ -16,7 +17,7 @@ buildPythonApplication rec {
     sha256 = "4b3a1301e57bfd8dce939bf25ef8fbb4b23967fd0f878eede328bdcc41386bac";
   };
 
-  propagatedBuildInputs = [ filelock requests tqdm setuptools ];
+  propagatedBuildInputs = [ filelock requests tqdm setuptools six ];
 
   checkPhase = ''
     $out/bin/gdown --help > /dev/null