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-rw-r--r--lib/sqlalchemy/engine/default.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/engine/default.py b/lib/sqlalchemy/engine/default.py
index ea806deae..4d5f338bf 100644
--- a/lib/sqlalchemy/engine/default.py
+++ b/lib/sqlalchemy/engine/default.py
@@ -1129,7 +1129,7 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
key_to_dbapi_type = {}
for bindparam in self.compiled.bind_names:
key = self.compiled.bind_names[bindparam]
- dialect_impl = bindparam.type.dialect_impl(self.dialect)
+ dialect_impl = bindparam.type._unwrapped_dialect_impl(self.dialect)
dialect_impl_cls = type(dialect_impl)
dbtype = dialect_impl.get_dbapi_type(self.dialect.dbapi)
if dbtype is not None and (