diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index a658e51b..322d2d0e 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -367,9 +367,9 @@ void netif_poll_all(void);
 #endif /* ENABLE_LOOPBACK */
 
 #if LWIP_IPV6
-#define netif_ip6_addr(netif, i)  (&(netif->ip6_addr[(i)]))
-#define netif_ip6_addr_state(netif, i)  (netif->ip6_addr_state[(i)])
-#define netif_ip6_addr_set_state(netif, i, state)  (netif->ip6_addr_state[(i)] = (state))
+#define netif_ip6_addr(netif, i)  (&((netif)->ip6_addr[(i)]))
+#define netif_ip6_addr_state(netif, i)  ((netif)->ip6_addr_state[(i)])
+#define netif_ip6_addr_set_state(netif, i, state)  ((netif)->ip6_addr_state[(i)] = (state))
 s8_t netif_matches_ip6_addr(struct netif * netif, ip6_addr_t * ip6addr);
 void netif_create_ip6_linklocal_address(struct netif * netif, u8_t from_mac_48bit);
 #endif /* LWIP_IPV6 */