diff --git a/libs/core/langchain_core/output_parsers/__init__.py b/libs/core/langchain_core/output_parsers/__init__.py
index 319f9ae001e..c72c7f8506c 100644
--- a/libs/core/langchain_core/output_parsers/__init__.py
+++ b/libs/core/langchain_core/output_parsers/__init__.py
@@ -99,4 +99,4 @@ def __getattr__(attr_name: str) -> object:
 
 
 def __dir__() -> list[str]:
-    return list(__all__)
+    return __all__