diff --git a/dns/util.go b/dns/util.go
index ad52f051..b1541091 100644
--- a/dns/util.go
+++ b/dns/util.go
@@ -133,6 +133,7 @@ func transform(servers []NameServer, resolver *Resolver) []dnsClient {
 					ClientSessionCache: globalSessionCache,
 					// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
 					NextProtos: []string{"dns"},
+					ServerName: host,
 				},
 				UDPSize: 4096,
 				Timeout: 5 * time.Second,