diff --git a/pkgs/development/python-modules/lox/default.nix b/pkgs/development/python-modules/lox/default.nix
index bdbd10cd637c..d8db86940363 100644
--- a/pkgs/development/python-modules/lox/default.nix
+++ b/pkgs/development/python-modules/lox/default.nix
@@ -26,11 +26,6 @@ buildPythonPackage rec {
 
   dependencies = [ pathos ];
 
-  # setup.py requires pytest-runner for setuptools, which is wrong
-  postPatch = ''
-    substituteInPlace setup.py --replace-fail '"pytest-runner",' ""
-  '';
-
   pythonImportsCheck = [ "lox" ];
 
   disabledTests = [