Laptop automatically wakes up from suspension

I own a Dell Latitude e5430 laptop and an ASUS ZenBook UX425JA-PURE3 that both runs KDE Plasma. Suspension works as it should on the ASUS ZenBoook but the Dell Latitude automatically wakes up from suspension/sleep at seemingly random intervals. This is a problem as it automatically could wake up while it is in my backpack and overheat itself to permanent death.
Is there anything that can be done to prevent the automatic wake up on the Dell laptop?