diff --git a/backend/open_webui/main.py b/backend/open_webui/main.py
index 86e6e4d451..bf85978874 100644
--- a/backend/open_webui/main.py
+++ b/backend/open_webui/main.py
@@ -1411,7 +1411,7 @@ async def chat_completion(
         )
 
         # Model Params
-        if not stream_delta_chunk_size and model_info_params:
+        if model_info_params.get("stream_delta_chunk_size"):
             stream_delta_chunk_size = model_info_params.get("stream_delta_chunk_size")
 
         metadata = {