sql – Missing right parenthesis in Define


I’m having trouble with a function, I’m trying to define this “Months” as
DEFINE Months='TRUNC(months_between(sysdate,hiredate)-(trunc(months_between(sysdate,hiredate)/12)*12)',
but it’s telling me im missing a right parantesis and for the love of god i can’t find my mistake. Can somebody help me