diff --git a/src/pipecat/services/google/google.py b/src/pipecat/services/google/google.py
index 554d9cb6b..3d207a254 100644
--- a/src/pipecat/services/google/google.py
+++ b/src/pipecat/services/google/google.py
@@ -605,14 +605,14 @@ class GoogleAssistantContextAggregator(OpenAIAssistantContextAggregator):
                 frame.function_name, frame.tool_call_id, frame.result
             )
         else:
-            response = {"response": "COMPLETED"}
             await self._update_function_call_result(
-                frame.function_name, frame.tool_call_id, response
+                frame.function_name, frame.tool_call_id, "COMPLETED"
             )
 
     async def handle_function_call_cancel(self, frame: FunctionCallCancelFrame):
-        response = {"response": "CANCELLED"}
-        await self._update_function_call_result(frame.function_name, frame.tool_call_id, response)
+        await self._update_function_call_result(
+            frame.function_name, frame.tool_call_id, "CANCELLED"
+        )
 
     async def _update_function_call_result(
         self, function_name: str, tool_call_id: str, result: Any
@@ -621,12 +621,11 @@ class GoogleAssistantContextAggregator(OpenAIAssistantContextAggregator):
             if message.role == "user":
                 for part in message.parts:
                     if part.function_response and part.function_response.id == tool_call_id:
-                        part.function_response.response = result
+                        part.function_response.response = {"value": json.dumps(result)}
 
     async def handle_user_image_frame(self, frame: UserImageRawFrame):
-        response = {"response": "COMPLETED"}
         await self._update_function_call_result(
-            frame.request.function_name, frame.request.tool_call_id, response
+            frame.request.function_name, frame.request.tool_call_id, "COMPLETED"
         )
         self._context.add_image_frame_message(
             format=frame.format,
diff --git a/tests/test_context_aggregators.py b/tests/test_context_aggregators.py
index baee3496f..df00f11e4 100644
--- a/tests/test_context_aggregators.py
+++ b/tests/test_context_aggregators.py
@@ -735,4 +735,4 @@ class TestGoogleAssistantContextAggregator(
 
     def check_function_call_result(self, context: OpenAILLMContext, index: int, content: Any):
         obj = glm.Content.to_dict(context.messages[index])
-        assert obj["parts"][0]["function_response"]["response"] == content
+        assert obj["parts"][0]["function_response"]["response"]["value"] == json.dumps(content)