diff --git a/pkgs/development/python-modules/cherrypy/default.nix b/pkgs/development/python-modules/cherrypy/default.nix
--- a/pkgs/development/python-modules/cherrypy/default.nix
+++ b/pkgs/development/python-modules/cherrypy/default.nix
@@ -38,6 +38,7 @@ buildPythonPackage rec {
   checkPhase = ''
     substituteInPlace pytest.ini --replace "--doctest-modules" ""
     pytest \
+      -W ignore \
       -k 'not KeyboardInterrupt and not daemonize and not Autoreload' \
       --deselect=cherrypy/test/test_static.py::StaticTest::test_null_bytes \
       --deselect=cherrypy/test/test_tools.py::ToolTests::testCombinedTools \