diff --git a/langchain/chat_models/vertexai.py b/langchain/chat_models/vertexai.py
index 87cf0ee9..4f78b310 100644
--- a/langchain/chat_models/vertexai.py
+++ b/langchain/chat_models/vertexai.py
@@ -122,7 +122,7 @@ class ChatVertexAI(_VertexAICommon, BaseChatModel):
         chat = self.client.start_chat(context=context, **self._default_params)
         for pair in history.history:
             chat._history.append((pair.question.content, pair.answer.content))
-        response = chat.send_message(question.content)
+        response = chat.send_message(question.content, **self._default_params)
         text = self._enforce_stop_words(response.text, stop)
         return ChatResult(generations=[ChatGeneration(message=AIMessage(content=text))])