diff --git a/nmrp.c b/nmrp.c
index 8a8a46f..eaa73b5 100644
--- a/nmrp.c
+++ b/nmrp.c
@@ -497,7 +497,7 @@ int nmrp_do(struct nmrpd_args *args)
 		bool unplugged = true;
 		time_t beg = time_monotonic();
 
-		while (!g_interrupted && (time_monotonic() - beg) < 60) {
+		while (!g_interrupted && (time_monotonic() - beg) < NMRP_ETH_TIMEOUT_S) {
 			if (!ethsock_is_unplugged(sock)) {
 				unplugged = false;
 				break;
diff --git a/nmrpd.h b/nmrpd.h
index c64c14d..da9b817 100644
--- a/nmrpd.h
+++ b/nmrpd.h
@@ -84,6 +84,8 @@
 #define NMRP_DEFAULT_SUBNET          "255.255.255.0"
 #define NMRP_DEFAULT_TFTP_PORT       69
 
+#define NMRP_ETH_TIMEOUT_S           60
+
 struct eth_hdr {
 	uint8_t ether_dhost[6];
 	uint8_t ether_shost[6];