We’ve always heard that being a workaholic isn’t healthy, but a new study out of France begs to differ.

Dr. Yehuda (“Ya-HOO-duh”) Baruch is a management professor at the Rouen (“ROO-en”) Business School in France. He recently analyzed workaholics from a wide range of industries and had them complete questionnaires about their daily activities, and home and work balance. He asked them questions like, “How do you feel when you turn in a project before deadline?” or “When was the last time you argued with your partner about work?”

The result? A lot of workaholics are happy with their work-life balance and logging in 14-hour-plus days makes them feel good about themselves. And experts say that’s a win-win situation, because it boosts their self-worth, their relationships and the company’s bottom line.

But there’s a catch: Workaholism is only a good thing if you want to work long hours. If you’re crunching numbers until midnight because your monster boss is forcing you or because you’re cash-strapped and need the overtime. Then that’s dangerous and destructive.

Lead researcher Dr. Baruch explains that’s because instead of the work fulfilling you, it takes over you, like a harmful addiction to the point where you become so consumed by work in a negative way. That can lead to chronic stress, and sends your personal relationships into a nosedive. In fact, one University of North Carolina study found that marriages involving workaholics are twice as likely to end in divorce.

Bottom line: Being a workaholic is OK as long as you’re 100-percent happy about it and loving what you do.