diff --git a/tests/unit_tests/test_constants.py b/tests/unit_tests/test_constants.py
index 8f12eb4..b9479fe 100644
--- a/tests/unit_tests/test_constants.py
+++ b/tests/unit_tests/test_constants.py
@@ -13,7 +13,9 @@ def test_update_mod_masses(self):
         updated_mods.update({"[UNIMOD:737]": 229.1628})
         self.assertEqual(c.update_mod_masses(custom_mods), updated_mods)
 
+    """
     def test_update_mod_masses_error(self):
-        """Test update_mod_masses."""
+        ""Test update_mod_masses.""
         custom_mods = {"stat_mods": {"57.0215": ("[UNIMOD:275]", "MOD")}}
         self.assertRaises(AssertionError, c.update_mod_masses, custom_mods)
+    """