diff --git a/stdlib/3/typing.pyi b/stdlib/3/typing.pyi
index 7d9ea2d8e..646b3fdf0 100644
--- a/stdlib/3/typing.pyi
+++ b/stdlib/3/typing.pyi
@@ -542,6 +542,7 @@ def cast(tp: Type[_T], obj: Any) -> _T: ...
 # NamedTuple is special-cased in the type checker
 class NamedTuple(tuple):
     _field_types = ...  # type: collections.OrderedDict[str, Type[Any]]
+    _field_defaults: Dict[str, Any] = ...
     _fields = ...  # type: Tuple[str, ...]
     _source = ...  # type: str