diff --git a/litellm/responses/litellm_completion_transformation/transformation.py b/litellm/responses/litellm_completion_transformation/transformation.py
index e2ba8353591..d3d30642216 100644
--- a/litellm/responses/litellm_completion_transformation/transformation.py
+++ b/litellm/responses/litellm_completion_transformation/transformation.py
@@ -148,7 +148,9 @@ class LiteLLMCompletionResponsesConfig:
                 # which is equivalent to "required" in OpenAI format
                 return "required"
             elif tool_choice_type == "function":
-                # function type without name - fall back to required
+                function_name = tool_choice.get("name")
+                if function_name:
+                    return {"type": "function", "function": {"name": function_name}}
                 return "required"
 
         # Return as-is for unknown formats
diff --git a/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py b/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
index 503a610e016..960fca205ce 100644
--- a/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
+++ b/tests/test_litellm/responses/litellm_completion_transformation/test_litellm_completion_responses.py
@@ -949,6 +949,28 @@ class TestToolChoiceTransformation:
         result = LiteLLMCompletionResponsesConfig._transform_tool_choice(tool_choice)
         assert result == tool_choice
 
+    def test_transform_tool_choice_responses_flat_function_name(self):
+        """Responses-API forced-function with a top-level name maps to the nested Chat
+        Completions shape instead of degrading to required and dropping the name"""
+        result = LiteLLMCompletionResponsesConfig._transform_tool_choice(
+            {"type": "function", "name": "get_weather"}
+        )
+        assert result == {"type": "function", "function": {"name": "get_weather"}}
+
+    def test_transform_tool_choice_function_without_name_falls_back_to_required(self):
+        """A function-type dict with no name still falls back to required"""
+        result = LiteLLMCompletionResponsesConfig._transform_tool_choice(
+            {"type": "function"}
+        )
+        assert result == "required"
+
+    def test_transform_tool_choice_function_empty_name_falls_back_to_required(self):
+        """An empty top-level name is falsy and must not produce an empty function name"""
+        result = LiteLLMCompletionResponsesConfig._transform_tool_choice(
+            {"type": "function", "name": ""}
+        )
+        assert result == "required"
+
 
 class TestContentTypeTransformation:
     """Test content type transformation from Responses API to Chat Completion format"""