diff --git a/drivers/md/md.h b/drivers/md/md.h
index 4565f17fc0489889c215c0c3305883dc5b8fd6d1..0954b9fe4cf6b57f260abb9ec48639df4151cff2 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -530,9 +530,9 @@ struct mddev {
 	bool	serialize_policy:1;
 
 	/* Used to synchronize idle and frozen for action_store() */
-	struct mutex sync_mutex;
+	KABI_EXTEND(struct mutex sync_mutex)
 	/* The sequence number for sync thread */
-	atomic_t sync_seq;
+	KABI_EXTEND(atomic_t sync_seq)
 };
 
 enum recovery_flags {