diff --git a/google/genai/tests/errors/test_api_error.py b/google/genai/tests/errors/test_api_error.py
index b7bb1cb12..bb269da43 100644
--- a/google/genai/tests/errors/test_api_error.py
+++ b/google/genai/tests/errors/test_api_error.py
@@ -268,7 +268,7 @@ def test_constructor_with_websocket_connection_closed_error():
   assert (
       actual_error.details
       == 'At most one response modality can be specified in the setup request.'
-      ' To enable simultaneous transcription and audio output,',
+      ' To enable simultaneous transcription and audio output,'
   )
   assert actual_error.status == None
   assert actual_error.message == None