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-rw-r--r--lib/sqlalchemy/orm/attributes.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index 7647bf9d0..3a786c73d 100644
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -1538,4 +1538,4 @@ def flag_modified(instance, key):
"""
state, dict_ = instance_state(instance), instance_dict(instance)
impl = state.manager[key].impl
- state._modified_event(dict_, impl, NO_VALUE)
+ state._modified_event(dict_, impl, NO_VALUE, force=True)