The next time your boss gives you the blues, you might want to consider the following report. A Swedish study found that workers’ risks for angina, heart attack and death rose along with the reported incompetence of their bosses.

The study, conducted by the Karolinska Institute and Stress Research Institute at Stockholm University, collected data on men ages 19 to 70 who had their hearts checked at work between 1992 and 1995. The researchers then matched these men with hospital records for heart disease, illness and death up to 2003. During the follow-up period, there were 74 cases of fatal and nonfatal heart attack or angina or death from heart disease.

Researchers found that the more competent the men thought their bosses were, the lower their risk of developing heart disease. In contrast, the lower the men rated their bosses, the higher the risk of heart disease. “Stress-related diseases are a large problem in our society. The workplace is one area in which stress occurs and thus can be reduced,” says the report’s lead researcher Anna Nyberg. “This study suggests that psychosocial work environment interventions could be directed towards manager in order to reduce stress in employees.”

Learn more about stress in the workplace here.