diff --git a/test/test_serialization.py b/test/test_serialization.py
index 66a1d88..392bbd2 100644
--- a/test/test_serialization.py
+++ b/test/test_serialization.py
@@ -175,6 +175,11 @@ def test_from_bytes_traversal_limit(all_types):
     bld.init("structList", size)
     data = bld.to_bytes()
 
+    msg = all_types.TestAllTypes.from_bytes(data)
+    with pytest.raises(capnp.KjException):
+        for i in range(0, size):
+            msg.structList[i].uInt8Field == 0
+
     msg = all_types.TestAllTypes.from_bytes(data,
         traversal_limit_in_words=2**62)
     for i in range(0, size):
@@ -187,6 +192,11 @@ def test_from_bytes_packed_traversal_limit(all_types):
     bld.init("structList", size)
     data = bld.to_bytes_packed()
 
+    msg = all_types.TestAllTypes.from_bytes_packed(data)
+    with pytest.raises(capnp.KjException):
+        for i in range(0, size):
+            msg.structList[i].uInt8Field == 0
+
     msg = all_types.TestAllTypes.from_bytes_packed(data,
         traversal_limit_in_words=2**62)
     for i in range(0, size):