diff --git a/rag/llm/chat_model.py b/rag/llm/chat_model.py
index 77f2714b9..114d7a0fe 100644
--- a/rag/llm/chat_model.py
+++ b/rag/llm/chat_model.py
@@ -1358,7 +1358,7 @@ class AnthropicChat(Base):
                 stream=True,
                 **gen_conf,
             )
-            for res in response.iter_lines():
+            for res in response:
                 if res.type == 'content_block_delta':
                     text = res.delta.text
                     ans += text