OK?

diff --git parse.y parse.y
index 5101770e7ad..0e11d4edf29 100644
--- parse.y
+++ parse.y
@@ -223,7 +223,7 @@ varset		: STRING '=' string {
 		;
 
 conf_main	: ROUTERID STRING {
-			if (!inet_aton($2, &conf->rtr_id)) {
+			if (!inet_pton(AF_INET, $2, &conf->rtr_id)) {
 				yyerror("error parsing router-id");
 				free($2);
 				YYERROR;

-- 
In my defence, I have been left unsupervised.