diff --git a/src/arcaflow_plugin_sdk/test_schema.py b/src/arcaflow_plugin_sdk/test_schema.py
index f9488d6..a20947b 100644
--- a/src/arcaflow_plugin_sdk/test_schema.py
+++ b/src/arcaflow_plugin_sdk/test_schema.py
@@ -967,7 +967,7 @@ class TestData1:
                 = dataclasses.field(default_factory=list)
 
         schema.test_object_serialization(
-            TestData1(A="Hello world!", B=5, C={}, D=[], H=3.14),
+            TestData1(A="Hello world!", B=5, C={}, D=[], H=3.14, J=[{"a": "b"}]),
             self.fail,
         )