diff --git a/django-stubs/db/models/manager.pyi b/django-stubs/db/models/manager.pyi
index 9ba593c..50bef8d 100644
--- a/django-stubs/db/models/manager.pyi
+++ b/django-stubs/db/models/manager.pyi
@@ -13,6 +13,7 @@ class BaseManager(QuerySet[_T]):
     name: str = ...
     model: Type[_T] = ...
     db: str
+    _db: Optional[str]
     def __init__(self) -> None: ...
     def deconstruct(self) -> Tuple[bool, str, None, Tuple, Dict[str, int]]: ...
     def check(self, **kwargs: Any) -> List[Any]: ...