Let’s say you’ve been in media for oh, about 10 years now. Guess what? You could be making some major blunders at the office that make you look green. Really green.

If you want to look like a polished pro, it’s time to ditch the following habits that are making you look like a rookie, as pointed out by a blog post on U.S. News & World Report.

1. You’re late. We’re not talking about being late one day because your train was 40 minutes late to the station or because you got a flat tire. We’re talking repeated tardiness to the point where you not only show up late, you’re disheveled as well. The piece points out, “Nothing says, ‘I’m unreliable,’ quite like working on your own schedule with complete disregard for the needs of others.” Read more