diff --git a/langchain/chains/conversation/base.py b/langchain/chains/conversation/base.py
index 0a1b9de5a4..8112187de4 100644
--- a/langchain/chains/conversation/base.py
+++ b/langchain/chains/conversation/base.py
@@ -27,7 +27,6 @@ class ConversationChain(LLMChain, BaseModel):
 
     input_key: str = "input"  #: :meta private:
     output_key: str = "response"  #: :meta private:
-    buffer: str = ""  #: :meta private:
 
     class Config:
         """Configuration for this pydantic object."""