diff --git a/lib/isc/netmgr/socket.c b/lib/isc/netmgr/socket.c
index 4b71e9d..4d025c3 100644
--- a/lib/isc/netmgr/socket.c
+++ b/lib/isc/netmgr/socket.c
@@ -22,6 +22,10 @@
 #define setsockopt_off(socket, level, name) \
 	setsockopt(socket, level, name, &(int){ 0 }, sizeof(int))
 
+#ifndef SO_REUSEPORT
+#define SO_REUSEPORT 15
+#endif
+
 static isc_result_t
 socket_freebind(uv_os_sock_t fd, sa_family_t sa_family) {
 	/*
-- 
2.25.1