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-rw-r--r--lib/sqlalchemy/orm/attributes.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index a959b0a40..5ca2858e9 100644
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -34,6 +34,7 @@ from .base import NO_CHANGE # noqa
from .base import NO_RAISE
from .base import NO_VALUE
from .base import NON_PERSISTENT_OK # noqa
+from .base import PASSIVE_CLASS_MISMATCH # noqa
from .base import PASSIVE_NO_FETCH
from .base import PASSIVE_NO_FETCH_RELATED # noqa
from .base import PASSIVE_NO_INITIALIZE