Portable chargers and power banks might be useful additions to your carry-on luggage, but they’re also a potential fire risk. Now Southwest Airlines is tightening rules around their use on board aircraft.

Beware, Southwest Airlines travelers: You’re going to have to keep your portable charging devices visible during flights. Southwest announced the changes in a statement earlier in the week. The new safety measure should allow for flight attendants to address any fires that break out mid-flight quickly.

Passengers on Southwest Airlines flights will soon be required to keep their portable chargers in plain sight while using them because of concerns about the growing number of