fitbit air counting steps while in car

hey guys, i'm on my 4th day of using fitbit air and i'm impressed by how good it is.

it's tracking pretty much everything (just missing skin temperature) and i haven't had any problems at all until today.

i had a 40 min car ride, i was a passenger, and fitbit air tracked around 700–800 steps.

i wasn't moving my arms at all because i was holding my dog.

do you know if there's any way to fix this? it's not a big problem, but it could become one on longer trips while traveling.