diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index b9c0b7779122..888f337a194b 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -452,7 +452,7 @@ struct batadv_orig_node {
 	 * @tt_buff_len: length of the last tt changeset this node received
 	 *  from the orig node
 	 */
-	s16 tt_buff_len;
+	u16 tt_buff_len;
 
 	/** @tt_buff_lock: lock that protects tt_buff and tt_buff_len */
 	spinlock_t tt_buff_lock;