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-rw-r--r--lib/sqlalchemy/dialects/postgresql/base.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/dialects/postgresql/base.py b/lib/sqlalchemy/dialects/postgresql/base.py
index 85f82ec60..9898e4ba4 100644
--- a/lib/sqlalchemy/dialects/postgresql/base.py
+++ b/lib/sqlalchemy/dialects/postgresql/base.py
@@ -2442,7 +2442,8 @@ class PGDialect(default.DefaultDialect):
if default is not None:
match = re.search(r"""(nextval\(')([^']+)('.*$)""", default)
if match is not None:
- autoincrement = True
+ if issubclass(coltype._type_affinity, sqltypes.Integer):
+ autoincrement = True
# the default is related to a Sequence
sch = schema
if '.' not in match.group(2) and sch is not None: