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-rw-r--r--lib/sqlalchemy/ext/declarative/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/declarative/base.py b/lib/sqlalchemy/ext/declarative/base.py
index 0e68faa03..308c09691 100644
--- a/lib/sqlalchemy/ext/declarative/base.py
+++ b/lib/sqlalchemy/ext/declarative/base.py
@@ -56,7 +56,7 @@ def _as_declarative(cls, classname, dict_):
@event.listens_for(mapper, "before_configured")
def go():
cls.__declare_first__()
- if '__abstract__' in base.__dict__:
+ if '__abstract__' in base.__dict__ and base.__abstract__:
if (base is cls or
(base in cls.__bases__ and not _is_declarative_inherits)
):