diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 41c1ad33d009..ae5762af0146 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -630,7 +630,7 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
  */
 void batadv_update_min_mtu(struct net_device *soft_iface)
 {
-	soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
+	dev_set_mtu(soft_iface, batadv_hardif_min_mtu(soft_iface));
 
 	/* Check if the local translate table should be cleaned up to match a
 	 * new (and smaller) MTU.