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Video for Linux driver does not increment sequence counter

I have a video device with configuration of V4L2_BUF_TYPE_VIDEO_CAPTURE and V4L2_MEMORY_MMAP. Further, I do the usual  VIDIOC_QBUF / VIDIOC_DQBUF loop for capturing the images from my camera. However, if I check the sequence field of the buffer of type v4l2_buffer, it is always zero. According to the V4L documentation, this counter should be increased with each incoming frame. Did I misunderstand something, or is this indeed a bug? Somebody has any thought on this?