diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 6933b41..336ae44 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -852,6 +852,9 @@
         check(-1<<1000, [traceback[-1]])
         check(None, traceback)
 
+    def test_no_duplicates_in_meta_path(self):
+        self.assertEqual(len(sys.meta_path), len(set(sys.meta_path)))
+
 
 @test.support.cpython_only
 class SizeofTest(unittest.TestCase):