diff --git a/libs/vertexai/langchain_google_vertexai/chat_models.py b/libs/vertexai/langchain_google_vertexai/chat_models.py
index 1c62d76c7..4233b43a4 100644
--- a/libs/vertexai/langchain_google_vertexai/chat_models.py
+++ b/libs/vertexai/langchain_google_vertexai/chat_models.py
@@ -395,7 +395,7 @@ def _generate(
             response = chat.send_message(question.content, **msg_params)
             generations = [
                 ChatGeneration(
-                    message=AIMessage(content=r.text),
+                    message=AIMessage(content=r.text),  # type: ignore
                     generation_info=get_generation_info(r, self._is_gemini_model),
                 )
                 for r in response.candidates