diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 759e4b7f3..d1f3e0d02 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -738,11 +738,15 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
         self.assertRaises(ValueError, copy.copy, d)
         self.assertRaises(ValueError, copy.deepcopy, d)
 
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
     def test_compresspickle(self):
         for proto in range(pickle.HIGHEST_PROTOCOL + 1):
             with self.assertRaises((TypeError, pickle.PicklingError)):
                 pickle.dumps(zlib.compressobj(zlib.Z_BEST_COMPRESSION), proto)
 
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
     def test_decompresspickle(self):
         for proto in range(pickle.HIGHEST_PROTOCOL + 1):
             with self.assertRaises((TypeError, pickle.PicklingError)):