Tesla said on Thursday it is recalling 46,096 Cybertruck vehicles in the U.S. over an exterior panel that can detach while driving, after more than six call-backs for the pickups last year.

Tesla is recalling the vehicles over issues of the cant rail — a stainless-steel exterior trim panel — delaminating and detaching from the vehicle, it said.

As a remedy, Tesla service will replace the rail assembly free of charge.

Shares of the EV-maker remained largely unchanged in premarket trading.