diff --git a/litellm/utils.py b/litellm/utils.py
index ac00a457b..f806ad15e 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -5274,7 +5274,7 @@ def get_optional_params(
         if tool_choice is not None:
             optional_params["tool_choice"] = tool_choice
         if response_format is not None:
-            optional_params["response_format"] = tool_choice
+            optional_params["response_format"] = response_format
 
     elif custom_llm_provider == "openrouter":
         supported_params = get_supported_openai_params(