I Really Like Free Candy

I work with a guy who has diabetes.  He has a gumball machine in his office and he keeps it filled with jellybeans and other assorted candies, presumably in case of emergency.  He’s been on vacation for the past couple of weeks but his office has been unlocked and I’ve been going in, using a penny from the dish on his desk, and getting some candy.  Stealing candy from a diabetic.  Is that wrong?