diff --git a/dns_challenge.go b/dns_challenge.go
index 5e1a4415ac84902a4cc4c1b40d2ef2639ff7b256..8ea71eeb3e6959b00980c3cc0ca42f72ac860442 100644
--- a/dns_challenge.go
+++ b/dns_challenge.go
@@ -96,7 +96,7 @@ func (d *dnsValidator) Fulfill(ctx context.Context, client *acme.Client, domain
 	}
 
 	zone = dns.Fqdn(zone)
-	fqdn := dns.Fqdn(domain)
+	fqdn := dns.Fqdn("_acme-challenge." + domain)
 
 	value, err := client.DNS01ChallengeRecord(chal.Token)
 	if err != nil {