diff --git a/mdns.c b/mdns.c
index 50ff2b1..3313e9e 100644
--- a/mdns.c
+++ b/mdns.c
@@ -40,10 +40,6 @@
 #include <netinet/in.h>
 #endif
 
-/* see RFC 6762 Section 10 */
-#define DEFAULT_TTL_FOR_RECORD_WITH_HOSTNAME 120
-#define DEFAULT_TTL 4500
-
 /* DETECT_CYCLE checks malformed packet you should handle the value carefully */
 /* https://www.kb.cert.org/vuls/id/23495 */
 #define DETECT_CYCLE            255
diff --git a/mdns.h b/mdns.h
index 79b44c8..45aff88 100644
--- a/mdns.h
+++ b/mdns.h
@@ -40,6 +40,12 @@
 #include <arpa/inet.h>
 #endif
 
+/* see RFC 6762 Section 10 */
+#define DEFAULT_TTL_FOR_RECORD_WITH_HOSTNAME 120
+#define DEFAULT_TTL 4500
+/* see RFC 6762 Section 5.4 */
+#define DEFAULT_TTL_LEGACY 10
+
 #ifndef MDNS_DEBUG_PRINTF
 #define MDNS_DEBUG_PRINTF	0
 #endif