diff --git a/trio/_core/_tests/test_run.py b/trio/_core/_tests/test_run.py
index 56691b31d5..650f8ef77f 100644
--- a/trio/_core/_tests/test_run.py
+++ b/trio/_core/_tests/test_run.py
@@ -2374,10 +2374,6 @@ async def crasher() -> NoReturn:
         gc.garbage.clear()
 
 
-@pytest.mark.xfail(
-    sys.version_info >= (3, 12),
-    reason="Waiting on https://github.com/python/cpython/issues/100964",
-)
 @pytest.mark.skipif(
     sys.implementation.name != "cpython", reason="Only makes sense with refcounting GC"
 )