diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 3df7742..16948ea 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -126,6 +126,7 @@
 struct disk_part_tbl {
 	struct rcu_head rcu_head;
 	int len;
+	struct hd_struct *last_lookup;
 	struct hd_struct *part[];
 };