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-rw-r--r--lib/sqlalchemy/ext/mutable.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/mutable.py b/lib/sqlalchemy/ext/mutable.py
index d3133b1f5..5458de381 100644
--- a/lib/sqlalchemy/ext/mutable.py
+++ b/lib/sqlalchemy/ext/mutable.py
@@ -595,7 +595,7 @@ def _setup_composite_listener():
issubclass(prop.composite_class, MutableComposite)):
prop.composite_class._listen_on_attribute(
getattr(class_, prop.key), False, class_)
- if not Mapper.dispatch.mapper_configured._contains(Mapper, _listen_for_type):
+ if not event.contains(Mapper, "mapper_configured", _listen_for_type):
event.listen(Mapper, 'mapper_configured', _listen_for_type)
_setup_composite_listener()