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Millennials are neglecting to take vacation days for fear of falling behind at work, according to a survey from LinkedIn.

More than half (56 percent) of all the survey respondents of all ages said the top reason for letting vacation days fall by the wayside is a fear of things piling up at work while away. About 70 percent of respondents said that even when they feel like they need a vacation, they won’t take the days.

Related: Budgeting for Vacation Never Works — Here's What You Should Do Instead

But the fear is even more potent for Millennials. Of the Millennial responders, 16 percent said they didn’t ask for days off because they were too nervous to ask. The results of the survey are not exactly surprising. Last year, a similar survey precisized that Millennial women were the least likely in the workplace to ask for time off “due to an overwhelming amount of reported guilt, fear, and work martyr habits.”

But that fear may actually be a paradox. According to Project Time Off (an initiative by the U.S. Travel Association), frequent travelers “report a higher likelihood of receiving a raise, bonus, or both than homebodies.” Those who didn’t take vacation days were five percentage points less likely to report a raise or a bonus in the last few years.

“You’re not alone if you feel guilty before asking for time off or shutting down your email on the beach, but you should ask,” Blair Decembrele, a director and career expert at LinkedIn, told Fortune. “It’s important for your well-being, and we often hear that taking time off makes people more productive when they come back.”

But to reap the maximum benefits of vacation, be sure to establish a communication strategy with coworkers before leaving. LinkedIn recommends establishing an OOO (out of office) point of contact to handle pressing issues in your absence and letting colleagues know how often you’ll be checking messages (if at all).

from travelandleisure.com