--- a/frontends/nss/ecm_nss_non_ported_ipv6.c
+++ b/frontends/nss/ecm_nss_non_ported_ipv6.c
@@ -342,7 +342,7 @@ static void ecm_nss_non_ported_ipv6_conn
 	ip_addr_t src_ip;
 	ip_addr_t dest_ip;
 	ecm_front_end_acceleration_mode_t result_mode;
-#if defined(ECM_INTERFACE_GRE_TAP_ENABLE) || defined(ECM_INTERFACE_GRE_TUN_ENABLE)
+#if defined(ECM_INTERFACE_GRE_TAP_ENABLE) || defined(ECM_INTERFACE_GRE_TUN_ENABLE) || defined(ECM_INTERFACE_TUNIPIP6_ENABLE)
 	struct net_device *dev;
 #endif