Deallocating sort segment in Oracle 9i2 ?

I need to shrink tempfile size without restarting database. I've temporary tablespace and during large sort operation it grew up to 1GB. V$SORT_USAGE returns no rows,
V$SORT_SEGMENT returns one sort segment with summary size about 1GB.

When I invoke (as described on metalink Note:132913.1)

SQL> ALTER tablespace TEMP default storage (pctincrease 0) I receive ORA-03217:invalid option for alter of TEMPORARY TABLESPACE

How can I deallocate this unused,unnecessary sort segment ???

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Jaroslaw Palka    <jpalka_at_interia.KILLSPAM.pl>
Katowice POLAND   <Remove KILLSPAM from address >