diff --git a/tests/integration/ai/test_agent_message_validation.py b/tests/integration/ai/test_agent_message_validation.py
index e5e3d86c..42deaf98 100644
--- a/tests/integration/ai/test_agent_message_validation.py
+++ b/tests/integration/ai/test_agent_message_validation.py
@@ -509,7 +509,7 @@ class _AlienStructuredOutputCall(StructuredOutputCall):
                     SubagentMessage(
                         name="my_agent",
                         call_id="id-1",
-                        result=SubagentTextResult("foo"),
+                        result=SubagentTextResult(content="foo"),
                     ),
                 ],
                 "thread_id should not be an empty string",