diff --git a/src/transport/tcp.c b/src/transport/tcp.c
index 5dfe5c4..23d6a4d 100644
--- a/src/transport/tcp.c
+++ b/src/transport/tcp.c
@@ -427,6 +427,9 @@ static int _tcp_error(char const * message, int code)
 static int _tcp_server_add_client(TCP * tcp, TCPSocket * client)
 {
 	TCPSocket ** p;
+#ifndef NI_MAXHOST
+# define NI_MAXHOST 256
+#endif
 	char host[NI_MAXHOST];
 	char const * name = host;
 
diff --git a/src/transport/udp.c b/src/transport/udp.c
index 333ed50..66eabc1 100644
--- a/src/transport/udp.c
+++ b/src/transport/udp.c
@@ -393,6 +393,9 @@ static int _udp_client_init(UDPClient * client, struct sockaddr * sa,
 		socklen_t sa_len, UDP * udp)
 {
 	AppTransportPluginHelper * helper = udp->helper;
+#ifndef NI_MAXHOST
+# define NI_MAXHOST 256
+#endif
 	char host[NI_MAXHOST];
 	char const * name = host;