diff --git a/mud.c b/mud.c
index 91723db..3a0cdda 100644
--- a/mud.c
+++ b/mud.c
@@ -502,9 +502,12 @@ mud_cmp_addr(struct sockaddr_storage *a, struct sockaddr_storage *b)
 }
 
 unsigned long
-mud_get_sync_elapsed_msec(struct mud *mud)
+mud_sync(struct mud *mud)
 {
     const uint64_t last = mud->last_recv_time;
+
+    mud_send(mud, NULL, 0, 0);
+
     return last ? MUD_TIME_MASK(mud_now() - last) / MUD_ONE_MSEC : ~0UL;
 }
 
diff --git a/mud.h b/mud.h
index 6be2827..09f0694 100644
--- a/mud.h
+++ b/mud.h
@@ -70,7 +70,7 @@ int mud_get_key (struct mud *, unsigned char *, size_t *);
 void   mud_set_mtu (struct mud *, size_t);
 size_t mud_get_mtu (struct mud *);
 
-unsigned long mud_get_sync_elapsed_msec (struct mud *);
+unsigned long mud_sync (struct mud *);
 
 int mud_set_send_timeout   (struct mud *, unsigned long);
 int mud_set_time_tolerance (struct mud *, unsigned long);