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-rw-r--r--lib/sqlalchemy/orm/query.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py
index bec6f1c3e..ab31b328b 100644
--- a/lib/sqlalchemy/orm/query.py
+++ b/lib/sqlalchemy/orm/query.py
@@ -43,7 +43,7 @@ class Query(object):
self._with_options = []
self._lockmode = None
- self._extension = self.mapper.extension.copy()
+ self._extension = self.mapper.extension
self._entities = []
self._order_by = False
self._group_by = False