diff --git a/pkgs/development/python-modules/txaio/default.nix b/pkgs/development/python-modules/txaio/default.nix
index 0aaffe34c2d..02cf7c0fda6 100644
--- a/pkgs/development/python-modules/txaio/default.nix
+++ b/pkgs/development/python-modules/txaio/default.nix
@@ -5,7 +5,6 @@
 , pytest-asyncio
 , pytestCheckHook
 , pythonOlder
-, six
 , twisted
 , zope_interface
 }: