diff --git a/src/netif/etharp.c b/src/netif/etharp.c
index a6932521..0d5e2bb0 100644
--- a/src/netif/etharp.c
+++ b/src/netif/etharp.c
@@ -1348,7 +1348,7 @@ ethernet_input(struct pbuf *p, struct netif *netif)
 {
   struct eth_hdr* ethhdr;
   u16_t type;
-#if LWIP_ARP || ETHARP_SUPPORT_VLAN
+#if LWIP_ARP || ETHARP_SUPPORT_VLAN || LWIP_IPV6
   s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
 #endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */