--- a/src/director/director-connection.c	Thu Mar 30 01:42:53 2017 +0300
+++ b/src/director/director-connection.c	Thu Mar 30 15:53:59 2017 +0300
@@ -1012,8 +1012,10 @@
 	}
 
 	if (update) {
-		mail_host_set_down(host, down, last_updown_change);
-		mail_host_set_vhost_count(host, vhost_count);
+		const char *log_prefix = t_strdup_printf("director(%s): ",
+							 conn->name);
+		mail_host_set_down(host, down, last_updown_change, log_prefix);
+		mail_host_set_vhost_count(host, vhost_count, log_prefix);
 		director_update_host(conn->dir, src_host, dir_host, host);
 	} else {
 		dir_debug("Ignoring host %s update vhost_count=%u "