Was 2013 a bad year for your credibility rating? If you’re honest, you might have to admit to a slip-up or two. (Maybe not on par with the most notorious celebrities and politicians, but bad enough!) Perhaps you were late more times than you would like to admit, you missed several deadlines, you told a few white lies to clients, and somehow you turned into one of the office’s top gossips. There may even have been a couple of bigger transgressions: like promising to increase your sales by 50 percent and then coming in way under the mark (tanking your department in the eyes of the higher-ups).

Is it too late to redeem yourself?

Probably not, say Julie Miller and Brian Bedford, coauthors of “Culture Without Accountability—WTF? What’s the Fix?” Chances are you haven’t hit the credibility point of no return just yet—but salvaging your image requires making a herculean effort to be more accountable in 2014.

Here, Miller and Bedford share a tip to help you repair your credibility after it has taken a hit:

Credibility Repair #8: Say yes only when you mean yes. There are a lot of reasons why you might say yes to another person’s request when you truly don’t feel comfortable doing so. Maybe you’re a “pleaser” who hates disappointing others. Perhaps you want to avoid conflict. Or maybe you simply want to shut down an interaction that’s dragging on and on.

“Whatever your reasons, ‘yes’ doesn’t ultimately work unless you mean it,” points out Bedford. “You’ll either have to perform a task you don’t believe in or don’t want to do (which is bad), or you’ll have to break your word (which is worse). Say yes only when you mean it. Even if others don’t like hearing ‘no,’ your credibility will stay intact.”