The aim of the invention is to provide a lock for a motor vehicle, whereby the accidental opening of said lock is prevented. To achieve this aim, a lock comprises a locking mechanism with a rotary latch and a locking pawl for arresting the rotary latch in a latch position. In order to open the lock with minimum effort, an electric drive (1) is provided by means of which drive the locking pawl can be moved directly or indirectly out of its locking position. The lock is further provided with a movable blocking pawl (2), which can impede the electric drive (1) from opening the lock. For the locking mechanism to be electrically opened, the blocking pawl (2) needs to be moved out of its blocking position and the electric drive (1) needs be to actuated.