diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -704,6 +704,7 @@
         self.assertEqual(sys.implementation.name,
                          sys.implementation.name.lower())
 
+    @test.support.cpython_only
     def test_debugmallocstats(self):
         # Test sys._debugmallocstats()
         from test.script_helper import assert_python_ok