diff --git a/module/zfs/vdev.c b/module/zfs/vdev.c
index 5d5e3c5d1093..302458b73b2d 100644
--- a/module/zfs/vdev.c
+++ b/module/zfs/vdev.c
@@ -704,6 +704,7 @@ vdev_top_transfer(vdev_t *svd, vdev_t *tvd)
 
 	ASSERT(tvd == tvd->vdev_top);
 
+	tvd->vdev_pending_fastwrite = svd->vdev_pending_fastwrite;
 	tvd->vdev_ms_array = svd->vdev_ms_array;
 	tvd->vdev_ms_shift = svd->vdev_ms_shift;
 	tvd->vdev_ms_count = svd->vdev_ms_count;