diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h
index 442eacb..67f78d1 100644
--- a/net/batman-adv/hard-interface.h
+++ b/net/batman-adv/hard-interface.h
@@ -42,6 +42,7 @@
 int hardif_min_mtu(struct net_device *soft_iface);
 void update_min_mtu(struct net_device *soft_iface);
 void hardif_free_rcu(struct rcu_head *rcu);
+bool is_wifi_iface(int ifindex);
 
 static inline void hardif_free_ref(struct hard_iface *hard_iface)
 {