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-rw-r--r--lib/sqlalchemy/ext/declarative/api.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/declarative/api.py b/lib/sqlalchemy/ext/declarative/api.py
index 90076fdbb..b309a783a 100644
--- a/lib/sqlalchemy/ext/declarative/api.py
+++ b/lib/sqlalchemy/ext/declarative/api.py
@@ -10,7 +10,8 @@ from ...schema import Table, MetaData
from ...orm import synonym as _orm_synonym, mapper,\
comparable_property,\
interfaces
-from ...orm.util import polymorphic_union, _mapper_or_none
+from ...orm.util import polymorphic_union
+from ...orm.base import _mapper_or_none
from ... import exc
import weakref