diff --git a/pkgs/development/python-modules/rx/default.nix b/pkgs/development/python-modules/rx/default.nix
index 9bbac4b45437..f7858037dfda 100644
--- a/pkgs/development/python-modules/rx/default.nix
+++ b/pkgs/development/python-modules/rx/default.nix
@@ -22,10 +22,7 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ nose ];
 
-  # Some tests are nondeterministic. (`grep sleep -r tests`)
-  # test_timeout_schedule_action_cancel: https://hydra.nixos.org/build/74954646
-  # test_new_thread_scheduler_timeout: https://hydra.nixos.org/build/74949851
-  doCheck = false;
+  doCheck = false; # PyPI tarball does not provides tests
 
   pythonImportsCheck = [ "rx" ];