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-rw-r--r--alembic/autogenerate/api.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/alembic/autogenerate/api.py b/alembic/autogenerate/api.py
index b54e6aa..15b5b6b 100644
--- a/alembic/autogenerate/api.py
+++ b/alembic/autogenerate/api.py
@@ -395,7 +395,7 @@ class RevisionContext(object):
# renders
autogen_context.imports = set()
if migration_script.imports:
- autogen_context.imports.union_update(migration_script.imports)
+ autogen_context.imports.update(migration_script.imports)
render._render_python_into_templatevars(
autogen_context, migration_script, template_args
)