diff --git a/litellm/llms/gemini/chat/transformation.py b/litellm/llms/gemini/chat/transformation.py
index f6d075392b2..d5a5ab667a6 100644
--- a/litellm/llms/gemini/chat/transformation.py
+++ b/litellm/llms/gemini/chat/transformation.py
@@ -92,7 +92,7 @@ def get_supported_openai_params(self, model: str) -> List[str]:
             "parallel_tool_calls",
             "web_search_options",
         ]
-        if supports_reasoning(model):
+        if supports_reasoning(model, custom_llm_provider="gemini"):
             supported_params.append("reasoning_effort")
             supported_params.append("thinking")
         if self.is_model_gemini_audio_model(model):