diff --git a/src/core/dns.c b/src/core/dns.c
index e7b52d249..7b1caccb0 100644
--- a/src/core/dns.c
+++ b/src/core/dns.c
@@ -328,7 +328,9 @@ dns_init(void)
   /* initialize fallback dns DNS server address */
   ip_addr_t dnsserver;
   FALLBACK_DNS_SERVER_ADDRESS(&dnsserver);
+#if LWIP_IPV4 && LWIP_IPV6
   dnsserver.type = IPADDR_TYPE_V4;
+#endif
   dns_setserver(DNS_FALLBACK_SERVER_INDEX, &dnsserver);
 #endif /* FALLBACK_DNS_SERVER_ADDRESS */