diff --git a/pkgs/development/python-modules/txaio/default.nix b/pkgs/development/python-modules/txaio/default.nix
index 23c24f3e514..0aaffe34c2d 100644
--- a/pkgs/development/python-modules/txaio/default.nix
+++ b/pkgs/development/python-modules/txaio/default.nix
@@ -21,7 +21,6 @@ buildPythonPackage rec {
   };
 
   propagatedBuildInputs = [
-    six
     twisted
     zope_interface
   ];