diff --git a/codex-rs/core/tests/responses_headers.rs b/codex-rs/core/tests/responses_headers.rs
index dd40b5cb36..d84f1a998b 100644
--- a/codex-rs/core/tests/responses_headers.rs
+++ b/codex-rs/core/tests/responses_headers.rs
@@ -166,7 +166,7 @@ async fn responses_stream_includes_turn_metadata_header_when_set() {
     let config = Arc::new(config);
 
     let conversation_id = ThreadId::new();
-    let auth_mode = AuthMode::ChatGPT;
+    let auth_mode = AuthMode::Chatgpt;
     let session_source = SessionSource::SubAgent(SubAgentSource::Review);
     let model_info = ModelsManager::construct_model_info_offline(model.as_str(), &config);
     let otel_manager = OtelManager::new(