diff --git a/langchain/llms/openai.py b/langchain/llms/openai.py
index 8c6d100c790..a454b40c9bb 100644
--- a/langchain/llms/openai.py
+++ b/langchain/llms/openai.py
@@ -58,7 +58,7 @@ class BaseOpenAI(BaseLLM, BaseModel):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.forbid
+        extra = Extra.ignore
 
     @root_validator(pre=True)
     def build_extra(cls, values: Dict[str, Any]) -> Dict[str, Any]: