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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 d75cf667b..7f3aad8b0 100644
--- a/lib/sqlalchemy/ext/mutable.py
+++ b/lib/sqlalchemy/ext/mutable.py
@@ -219,7 +219,7 @@ from within the mutable extension::
data = Column(MutableDict.as_mutable(JSONEncodedDict))
@event.listens_for(MyDataClass.data, "modified")
- def modified_json(instance):
+ def modified_json(instance, initiator):
print("json value modified:", instance.data)
.. _mutable_composites: