1 files changed, 1 insertions, 1 deletions
diff --git a/ndp.c b/ndp.c
index 3a766ec..c04df6a 100644
--- a/ndp.c
+++ b/ndp.c
@@ -140,7 +140,7 @@ int ndp(struct ctx *c, struct ethhdr *eh, size_t len)
 
 		for (n = 0; *c->dns_search[n].n; n++)
 			dns_s_len += strlen(c->dns_search[n].n) + 2;
-		if (len) {
+		if (dns_s_len) {
 			*p++ = 31;			/* DNSSL */
 			*p++ = (len + 8 - 1) / 8 + 1;	/* length */
 			p += 2;				/* reserved */