1 files changed, 1 insertions, 1 deletions
diff --git a/ndp.c b/ndp.c
index 37bf7a3..ded2081 100644
--- a/ndp.c
+++ b/ndp.c
@@ -256,7 +256,7 @@ static void ndp_ra(const struct ctx *c, const struct in6_addr *dst)
 
 	ptr = &ra.var[0];
 
-	if (c->mtu != -1) {
+	if (c->mtu) {
 		struct opt_mtu *mtu = (struct opt_mtu *)ptr;
 		*mtu = (struct opt_mtu) {
 			.header = {