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-rw-r--r--lib/sqlalchemy/orm/util.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/util.py b/lib/sqlalchemy/orm/util.py
index b96387c08..2f78fa535 100644
--- a/lib/sqlalchemy/orm/util.py
+++ b/lib/sqlalchemy/orm/util.py
@@ -1035,6 +1035,7 @@ class _ORMJoin(expression.Join):
source_polymorphic=True,
dest_polymorphic=True,
of_type_mapper=right_info.mapper,
+ alias_secondary=True,
)
if sj is not None: