Declare cursor for --- the output of a stored procedure?

I have a stored procedure proc_users_select that returns a set of results.

I could do something like this:

DECLARE MY_CURSOR CURSOR FOR
SELECT * FROM USERS

however, my stored procedure isn't quite that simple, so what I'd rather do is:

DECLARE MY_CURSOR CURSOR FOR
proc_users_select

but I get an error message
Incorrect syntax near 'proc_users_select'.

Is this not allowed or is my syntax just wrong?

thanks