diff --git a/module/zfs/include/sys/vdev_disk.h b/module/zfs/include/sys/vdev_disk.h
index 38abf2e419..3d5ec0eb89 100644
--- a/module/zfs/include/sys/vdev_disk.h
+++ b/module/zfs/include/sys/vdev_disk.h
@@ -18,7 +18,6 @@ typedef struct vdev_disk {
 } vdev_disk_t;
 
 extern int vdev_disk_physio(ldi_handle_t, caddr_t, size_t, uint64_t, int);
-extern nvlist_t *vdev_disk_read_rootlabel(char *devpath);
 
 #endif
 
diff --git a/module/zfs/vdev_disk.c b/module/zfs/vdev_disk.c
index 19cef7339f..3e451525fa 100644
--- a/module/zfs/vdev_disk.c
+++ b/module/zfs/vdev_disk.c
@@ -639,7 +639,7 @@ vdev_disk_io_done(zio_t *zio)
 }
 
 nvlist_t *
-vdev_disk_read_rootlabel(char *devpath)
+vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
 {
 	return NULL;
 }