diff --git a/src/core/ipv6/nd6.c b/src/core/ipv6/nd6.c
index 5976986b..da373bd3 100644
--- a/src/core/ipv6/nd6.c
+++ b/src/core/ipv6/nd6.c
@@ -723,7 +723,7 @@ nd6_tmr(void)
         /* Try to get an address on this netif that is invalid.
          * Skip 0 index (link-local address) */
         for (j = 1; j < LWIP_IPV6_NUM_ADDRESSES; j++) {
-          if (netif_ip6_addr_state(prefix_list[i].netif, j) == IP6_ADDRESS_STATE_INVALID) {
+          if (netif_ip6_addr_state(prefix_list[i].netif, j) == IP6_ADDR_INVALID) {
             /* Generate an address using this prefix and interface ID from link-local address. */
             prefix_list[i].netif->ip6_addr[j].addr[0] = prefix_list[i].prefix.addr[0];
             prefix_list[i].netif->ip6_addr[j].addr[1] = prefix_list[i].prefix.addr[1];
diff --git a/src/include/ipv6/lwip/nd6.h b/src/include/ipv6/lwip/nd6.h
index 28636e89..193788fb 100644
--- a/src/include/ipv6/lwip/nd6.h
+++ b/src/include/ipv6/lwip/nd6.h
@@ -328,13 +328,6 @@ PACK_STRUCT_END
 #  include "arch/epstruct.h"
 #endif
 
-/* the possible states of an IP address */
-#define IP6_ADDRESS_STATE_INVALID     (0)
-#define IP6_ADDRESS_STATE_VALID       (0x4)
-#define IP6_ADDRESS_STATE_PREFERRED   (0x5) /* includes valid */
-#define IP6_ADDRESS_STATE_DEPRECATED  (0x6) /* includes valid */
-#define IP6_ADDRESS_STATE_TENTATIV    (0x8)
-
 /** 1 second period */
 #define ND6_TMR_INTERVAL 1000