diff --git a/dns/dns.go b/dns/dns.go
index 30daf8e..5542c78 100644
--- a/dns/dns.go
+++ b/dns/dns.go
@@ -180,7 +180,11 @@ func (ds *DNSList) DialContext(ctx context.Context, dialer *net.Dialer, firstFra
 				continue
 			}
 			tlsConn = tls.Client(conn, &tls.Config{ServerName: host})
-			err = terasu.Use(tlsConn).HandshakeContext(ctx, firstFragmentLen)
+			if firstFragmentLen > 0 {
+				err = terasu.Use(tlsConn).HandshakeContext(ctx, firstFragmentLen)
+			} else {
+				err = tlsConn.HandshakeContext(ctx)
+			}
 			if err == nil {
 				return nil
 			}
@@ -268,7 +272,7 @@ var IPv4Servers = DNSList{
 
 var DefaultResolver = &net.Resolver{
 	PreferGo: true,
-	Dial: func(ctx context.Context, _, _ string) (net.Conn, error) {
+	Dial: func(ctx context.Context, nw, _ string) (net.Conn, error) {
 		if ip.IsIPv6Available.Get() {
 			return IPv6Servers.DialContext(ctx, nil, terasu.DefaultFirstFragmentLen)
 		}
diff --git a/dns/doh.go b/dns/doh.go
index 76b118b..4611cc0 100644
--- a/dns/doh.go
+++ b/dns/doh.go
@@ -89,7 +89,11 @@ var trsHTTP2ClientWithSystemDNS = http.Client{
 					continue
 				}
 				tlsConn = tls.Client(conn, cfg)
-				err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				if terasu.DefaultFirstFragmentLen > 0 {
+					err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				} else {
+					err = tlsConn.HandshakeContext(ctx)
+				}
 				if err == nil {
 					break
 				}
diff --git a/http/http.go b/http/http.go
index 7e55fd0..913031c 100644
--- a/http/http.go
+++ b/http/http.go
@@ -61,7 +61,11 @@ var DefaultClient = http.Client{
 				tlsConn = tls.Client(conn, &tls.Config{
 					ServerName: host,
 				})
-				err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				if terasu.DefaultFirstFragmentLen > 0 {
+					err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				} else {
+					err = tlsConn.HandshakeContext(ctx)
+				}
 				if err == nil {
 					break
 				}
diff --git a/http2/http2.go b/http2/http2.go
index c6e738b..1d4b7e0 100644
--- a/http2/http2.go
+++ b/http2/http2.go
@@ -59,7 +59,11 @@ var DefaultClient = http.Client{
 					continue
 				}
 				tlsConn = tls.Client(conn, cfg)
-				err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				if terasu.DefaultFirstFragmentLen > 0 {
+					err = terasu.Use(tlsConn).HandshakeContext(ctx, terasu.DefaultFirstFragmentLen)
+				} else {
+					err = tlsConn.HandshakeContext(ctx)
+				}
 				if err == nil {
 					break
 				}