diff --git a/pkgs/development/python-modules/curio/default.nix b/pkgs/development/python-modules/curio/default.nix
index 03a5454f55ce..087d85405e26 100644
--- a/pkgs/development/python-modules/curio/default.nix
+++ b/pkgs/development/python-modules/curio/default.nix
@@ -38,6 +38,7 @@ buildPythonPackage rec {
 
   disabledTests =
     [
+      "test_cpu" # timing sensitive
       "test_aside_basic" # times out
       "test_write_timeout" # flaky, does not always time out
       "test_aside_cancel" # fails because modifies PYTHONPATH and cant find pytest