diff --git a/tests/core/test_openai_chatcompletions_stream.py b/tests/core/test_openai_chatcompletions_stream.py
index 6ae94df1..f17606b9 100644
--- a/tests/core/test_openai_chatcompletions_stream.py
+++ b/tests/core/test_openai_chatcompletions_stream.py
@@ -66,7 +66,7 @@ async def test_stream_response_yields_events_for_text_content(monkeypatch) -> No
             output=[],
             tool_choice="none",
             tools=[],
-            
+            parallel_tool_calls=False,
         )
         return resp, fake_stream()
 
@@ -155,7 +155,7 @@ async def test_stream_response_yields_events_for_refusal_content(monkeypatch) ->
             output=[],
             tool_choice="none",
             tools=[],
-            
+            parallel_tool_calls=False,
         )
         return resp, fake_stream()
 
@@ -242,7 +242,7 @@ async def test_stream_response_yields_events_for_tool_call(monkeypatch) -> None:
             output=[],
             tool_choice="none",
             tools=[],
-            
+            parallel_tool_calls=False,
         )
         return resp, fake_stream()
 
diff --git a/tests/fake_model.py b/tests/fake_model.py
index d3fcf6fb..a5cff359 100644
--- a/tests/fake_model.py
+++ b/tests/fake_model.py
@@ -124,5 +124,5 @@ def get_response_obj(output: list[TResponseOutputItem], response_id: str | None
         tool_choice="none",
         tools=[],
         top_p=None,
-        
+        parallel_tool_calls=False,
     )