diff --git a/tests/markers.py b/tests/markers.py
deleted file mode 100644
index 66291fca..00000000
--- a/tests/markers.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from __future__ import annotations
-
-from platform import python_implementation
-
-import pytest
-
-cpython_only = pytest.mark.skipif(python_implementation() != "CPython", reason="CPython only.")
diff --git a/tests/test_isolated.py b/tests/test_isolated.py
index de740f31..2d3ff972 100644
--- a/tests/test_isolated.py
+++ b/tests/test_isolated.py
@@ -1,11 +1,14 @@
 import pytest
 import importlib
 
-from .markers import cpython_only
+from watchdog.utils import platform
+
 from .utils import run_isolated_test
 
 
-@cpython_only
+# Kqueue isn't supported by Eventlet, so BSD is out
+# Current usage ReadDirectoryChangesW on Windows is blocking, though async may be possible
+@pytest.mark.skipif(not platform.is_linux(), reason="Eventlet only supported in Linux")
 def test_observer_stops_in_eventlet():
     if not importlib.util.find_spec('eventlet'):
         pytest.skip("eventlet not installed")
@@ -13,7 +16,7 @@ def test_observer_stops_in_eventlet():
     run_isolated_test('eventlet_observer_stops.py')
 
 
-@cpython_only
+@pytest.mark.skipif(not platform.is_linux(), reason="Eventlet only supported in Linux")
 def test_eventlet_skip_repeat_queue():
     if not importlib.util.find_spec('eventlet'):
         pytest.skip("eventlet not installed")