diff --git a/chain/sync.go b/chain/sync.go
index ca2996f51..0d45c3395 100644
--- a/chain/sync.go
+++ b/chain/sync.go
@@ -569,8 +569,7 @@ func (s *Syncer) Run(ctx context.Context) (err error) {
 		pool := x509.NewCertPool()
 		pool.AppendCertsFromPEM(s.opts.CA)
 		tc := &tls.Config{
-			MinVersion:       tls.VersionTLS12,
-			CurvePreferences: []tls.CurveID{tls.X25519, tls.CurveP256},
+			MinVersion: tls.VersionTLS12,
 			CipherSuites: []uint16{ // Only applies to TLS 1.2. TLS 1.3 ciphersuites are not configurable.
 				tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
 				tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,