diff --git a/internal/client/dnsdial/doh.go b/internal/client/dnsdial/doh.go
index af5ae84..2393ede 100644
--- a/internal/client/dnsdial/doh.go
+++ b/internal/client/dnsdial/doh.go
@@ -345,7 +345,9 @@ const (
 
 var udpDNSServersPtr atomic.Pointer[[]string]
 
-func init() {
+func init() { ResetUDPDNSServers() }
+
+func ResetUDPDNSServers() {
 	def := []string{
 		"77.88.8.8:53", "77.88.8.1:53",
 		"8.8.8.8:53", "8.8.4.4:53",
diff --git a/internal/session/session.go b/internal/session/session.go
index 5d432fb..aac72c2 100644
--- a/internal/session/session.go
+++ b/internal/session/session.go
@@ -187,9 +187,12 @@ func (s *Session) Run(ctx context.Context) (err error) {
 
 	log := s.deps.Logger
 	dnsdial.SetLogger(log)
-	if s.cfg.DNS.Servers != nil {
+
+	if len(s.cfg.DNS.Servers) > 0 {
 		dnsdial.SetUDPDNSServers(s.cfg.DNS.Servers)
 		log.Infof("[DNS] using custom UDP servers: %v", s.cfg.DNS.Servers)
+	} else {
+		dnsdial.ResetUDPDNSServers()
 	}
 	appDialer := dnsdial.AppDialer(s.cfg.DNS.Mode)
 	dnsdial.InstallGlobalResolver(s.cfg.DNS.Mode)