diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index fccc218..3d982f7 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -196,7 +196,7 @@
 	struct rcu_head		rcu;
 };
 
-static inline void ipv6_eth_mc_map(struct in6_addr *addr, char *buf)
+static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
 {
 	/*
 	 *	+-------+-------+-------+-------+-------+-------+
@@ -210,7 +210,7 @@
 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
 }
 
-static inline void ipv6_tr_mc_map(struct in6_addr *addr, char *buf)
+static inline void ipv6_tr_mc_map(const struct in6_addr *addr, char *buf)
 {
 	/* All nodes FF01::1, FF02::1, FF02::1:FFxx:xxxx */