Update statement with inner join on Oracle

I have a query which works fine in MySQL, but when I run it on Oracle I get the following error:

SQL Error: ORA-00933: SQL command not properly ended
00933. 00000 – “SQL command not properly ended”

The query is:

UPDATE table1
INNER JOIN table2 ON table1.value = table2.DESC
SET table1.value = table2.CODE
WHERE table1.UPDATETYPE='blah';