diff --git a/libs/core/langchain_core/messages/ai.py b/libs/core/langchain_core/messages/ai.py
index c667aa54e95..8f6cc9254fc 100644
--- a/libs/core/langchain_core/messages/ai.py
+++ b/libs/core/langchain_core/messages/ai.py
@@ -7,6 +7,9 @@ from langchain_core.messages.base import (
 )
 
 
+ERROR
+
+
 class AIMessage(BaseMessage):
     """Message from an AI."""