diff --git a/pkgs/development/python-modules/josepy/default.nix b/pkgs/development/python-modules/josepy/default.nix
index 140b65c73772..036b60e9eca2 100644
--- a/pkgs/development/python-modules/josepy/default.nix
+++ b/pkgs/development/python-modules/josepy/default.nix
@@ -33,6 +33,7 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace pytest.ini \
       --replace " --flake8 --cov-report xml --cov-report=term-missing --cov=josepy --cov-config .coveragerc" ""
+    sed -i '/flake8-ignore/d' pytest.ini
   '';
 
   pythonImportsCheck = [