postgres change column from boolean to inetger

gistfile1.sql

ALTER TABLE table_name ALTER column_name SET DEFAULT null;

ALTER TABLE table_name
ALTER column_name TYPE INTEGER
USING
CASE
WHEN false THEN 0
ELSE 1
END;

ALTER TABLE table_name ALTER column_name SET DEFAULT 0;
COMMIT;

Needs to be:

CASE column_name WHEN false THEN 0 ELSE 1 END;