SQL syntax error in trigger

SQL syntax error in trigger

Can someone tell me what this sql does not work? Where is the syntax error?
SET NEW.`modified` = CURTIME() WHERE `id` = NEW.id;
Error:
One or more errors have occured while processing your request: The
following query has failed: "CREATE DEFINER=root@localhost TRIGGER
event_name BEFORE UPDATE ON clients FOR EACH ROW SET NEW.modified =
CURTIME() WHERE id = NEW.id;" MySQL said: #1064 - You have an error in
your SQL syntax; check the manual that corresponds to your MariaDB server
version for the right syntax to use near 'WHERE id = NEW.id' at line 1
Image shows the error http://s23.postimg.org/rhsf2x1tn/screenshot.png