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-rw-r--r--lib/sqlalchemy/orm/util.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/util.py b/lib/sqlalchemy/orm/util.py
index 7966f6cd9..d3e36a494 100644
--- a/lib/sqlalchemy/orm/util.py
+++ b/lib/sqlalchemy/orm/util.py
@@ -1053,7 +1053,7 @@ class AliasedInsp(
@classmethod
def _with_polymorphic_factory(
cls,
- base: Union[_O, Mapper[_O]],
+ base: Union[Type[_O], Mapper[_O]],
classes: Union[Literal["*"], Iterable[_EntityType[Any]]],
selectable: Union[Literal[False, None], FromClause] = False,
flat: bool = False,