Your social calendar might be sucking the joy out of activities that are supposed to be fun or relaxing, according to an upcoming paper co-written by a professor who studies time management.

The paper argues that when a leisure activity is planned rather than spontaneous, we enjoy it less.

That’s because we tend to mentally lump all our scheduled activities in the same bucket and it makes the pleasurable activities more of a chore.

“It becomes a part of our to-do list,” wrote Selin A. Malkoc, one of the study’s authors, in an email to The Washington Post. “As an outcome, they become less enjoyable.”

The paper, to be published in the journal Current Opinion in Psychology in April, is written by Malkoc, an associate professor of marketing at Ohio State University, and Gabriela Tonietto, an assistant professor at Rutgers Business School. It notes that there are many things grabbing at our free time.

We schedule activities back-to-back for fear of not accomplishing them all. Malkoc links the over-scheduling of free time to the value that we place on achievement over contentment.

“The focus on productivity is so widespread that people even strive to make leisure productive and brag about being busy,” reads the paper.

So we do more and enjoy less.

“When scheduled, leisure tasks feel less free-flowing and more forced – which is what robs them of their utility,” Malkoc explained in her email.

So if we’re not supposed to schedule our free time, how are we expected to get anything done? Or see our friends?

The answer, according to Malkoc, is “rough scheduling,” meaning meeting for lunch or an after-work drink but not assigning it a time.

“As trivial as the change might seem, it has an important effect on human psychology: It reintroduces the flexibility to the leisure tasks,” she wrote in her email.

And if making a loose plan results in the meetup not happening, it might be a better outcome in some instances, she said.

“If things don’t work out, in all likelihood at least one of the parties was forcing themselves to make it happen – and thus would enjoy it less. So, maybe things worked out for the best, right?” she wrote.