diff --git a/modules/mol/alg/tests/test_chain_mapping.py b/modules/mol/alg/tests/test_chain_mapping.py
index 8cca758f1de3e8fa26067c1c7b29248fde8b06c3..e03ee7a07279e70906856ebc7f0457654e7925a0 100644
--- a/modules/mol/alg/tests/test_chain_mapping.py
+++ b/modules/mol/alg/tests/test_chain_mapping.py
@@ -426,10 +426,6 @@ class TestChainMapper(unittest.TestCase):
     with self.assertRaises(RuntimeError):
         ChainMapper(ref, trg_seqres_mapping=trg_seqres_mapping)
 
-    with self.assertRaises(RuntimeError):
-        ChainMapper(ref, seqres=seqres,
-                    trg_seqres_mapping=trg_seqres_mapping)
-
     seqres_duplicate = seq.CreateSequenceList()
     seqres_duplicate.AddSequence(seq.CreateSequence("1", "GAMDMKALQKELEQFAKLLKQKRITLGYTQA"
                                                "DVGLTLGVLFGKVFSQTTISRFEALQLSLKN"