diff --git a/include/sys/vdev.h b/include/sys/vdev.h
index 03e1f438a..05d18a36c 100644
--- a/include/sys/vdev.h
+++ b/include/sys/vdev.h
@@ -204,6 +204,7 @@ extern void vdev_label_write(zio_t *zio, vdev_t *vd, int l, abd_t *buf, uint64_t
     offset, uint64_t size, zio_done_func_t *done, void *priv, int flags);
 extern int vdev_label_read_bootenv(vdev_t *, nvlist_t *);
 extern int vdev_label_write_bootenv(vdev_t *, nvlist_t *);
+extern int vdev_check_boot_reserve(spa_t *, vdev_t *);
 
 typedef enum {
 	VDEV_LABEL_CREATE,	/* create/add a new device */