Every founder knows that culture is crucial to a startup’s success — as Fred Wilson says, “If you want to be in business forever, you need to build a culture that sustains the business” — but there are a few common mistakes that startups make when creating their culture:

1. YOU THINK CULTURE JUST "HAPPENS."

Running a startup means your burn rate is always in the forefront of your mind, and as a result, everything takes a backseat to getting to MVP. Culture can be fixed later, right? The truth is that “culture” is just another way of saying “how we work here,” and by the time you get to your MVP, it will be deeply entrenched.

FiveStars’s founder Victor Ho never took the time to officially define the culture— he felt it was too “cheesy.” But as they grew from 40 to 80 employees, their culture got diluted and as people clashed over ways of getting work done. As quoted in Fast Company, Ho described it as “one of the hardest periods of the company.” Rather than waiting to define your culture, consciously shape your culture while you build your MVP. You don’t have to go on an expensive company retreat, or write an elaborate culture deck. It can be as simple as writing down five words that describe your culture and once a month, as a team, discussing whether they’re still appropriate.

2. YOU THINK HIRING MORE PEOPLE MEANS SUCCESS.

Celebrating is so important because success at a startup can be so rare in the first months. It’s comforting to be able to point something that’s a clear sign it’s all working. And as Buffer’s founder noted, “Team size is easy to understand. Sometimes it impressed people when I told them how big the company was, and I was proud to share it.” But the company brought on too many people, too fast, and was forced to lay off 11% of the company. Protect team morale by tracking more accurate measures of success, and find ways to celebrate small wins regularly.

3. YOU SPEND TOO MUCH ON PERKS.

Bribing employees is a common Silicon Valley practice — what else are meals by gourmet chefs, meditation classes, and laundry service but attempts to get more work out of employees? And those bribes don’t come cheap: shrinking VC funds forced Dropbox to cancel its free shuttle and and limit free meals a few years ago.

If you really want your team to do their best work, regardless of your compensation budget, give them meaningful work. Show them how their work is directly impacting the organization, and how the organization is making a difference in the world. In other words, give them purpose. Oh, and don’t worry — “purpose” doesn’t necessarily have to be a product or service that saves the world (though that’s a plus); it just means that you have a compelling vision and mission.

4. YOU OVERWORK PEOPLE IN PURSUIT OF THE PRODUCT.

Signing up for a startup is a commitment; long hours and outrageous goals are part of the bargain. But push too hard, and you’ll flare out. At Zynga, for instance, long hours, “aggressive” deadlines, and an obsession with performance metrics led to a talent drain, and even hampered its ability to acquire companies. To prevent burnout, hold regular check-ins with your team to help them manage workload and stress levels. And don’t forget to check-in with the founder: 30% of founders report being depressed, as opposed to only 7% of the general population.

Again, we’re not saying you won’t spend some long nights and weekends at this office, but don’t make it a cultural norm.

5. YOU DON'T FIRE JERKS BECAUSE THEY'RE SMART.

Hiring the best talent is highly competitive, but ignore the “no asshole” rule at your own peril. Despite their superior skill set, their personality will destroy your team culture, not to mention their productivity. In one of our engagements, we worked with an executive whose attitude turned the rest of the team against him. This led him to protect his own job by guarding his data more and more closely, leaving the startup completely in the dark when making crucial decisions.

The best way to avoid this problem is to carefully screen for jerks during the interview process, listening for self-centered answers and trash talking past employers. (As Raylan Givens of Justified noted, “If you run into an asshole in the morning, you ran into an asshole. If you run into assholes all day, you’re the asshole.”) But if one has slipped past your radar, talk to them and make it clear how you expect their behavior to change. If they don’t shape up, then it’s time to go your separate ways — the rest of the team will thank you.

Written by Paula Cizek, Director of Knowledge & Editorial at NOBL. NOBL is an organizational and team design consultancy that unleashes the creativity and capability of teams through new ways of working.