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-rw-r--r--lib/sqlalchemy/orm/properties.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/properties.py b/lib/sqlalchemy/orm/properties.py
index 76bcde0dc..46c95109f 100644
--- a/lib/sqlalchemy/orm/properties.py
+++ b/lib/sqlalchemy/orm/properties.py
@@ -638,7 +638,7 @@ class PropertyLoader(StrategizedProperty):
else:
self.secondary_synchronize_pairs = None
- self._foreign_keys = util.Set(r for l, r in self.synchronize_pairs)
+ self._foreign_keys = set(r for l, r in self.synchronize_pairs)
if self.secondary_synchronize_pairs:
self._foreign_keys.update(r for l, r in self.secondary_synchronize_pairs)