diff --git a/common/tls/utls_client.go b/common/tls/utls_client.go
index c00918fe81..e57f7dc0eb 100644
--- a/common/tls/utls_client.go
+++ b/common/tls/utls_client.go
@@ -205,7 +205,14 @@ func NewUTLSClient(ctx context.Context, serverAddress string, options option.Out
 	if err != nil {
 		return nil, err
 	}
-	return &UTLSClientConfig{config: &tlsConfig, paddingSize: options.PaddingSize, id: id}, nil
+	if options.PaddingSize{
+		padding_size, err := option.ParseIntRange(options.PaddingSize)
+		if err != nil {
+			return nil, E.Cause(err, "invalid Padding Size supplied")
+		}
+		return &UTLSClientConfig{config: &tlsConfig, paddingSize: padding_size, id: id}, nil
+	}
+	return &UTLSClientConfig{config: &tlsConfig, id: id}, nil
 }
 
 var (
diff --git a/option/tls.go b/option/tls.go
index aac24b4309..4f6bb2dc7d 100644
--- a/option/tls.go
+++ b/option/tls.go
@@ -23,7 +23,7 @@ type OutboundTLSOptions struct {
 	MixedCaseSNI    bool                    `json:"mixedcase_sni,omitempty"`
 	ServerName      string                  `json:"server_name,omitempty"`
 	Insecure        bool                    `json:"insecure,omitempty"`
-	PaddingSize     [2]int                  `json:"padding_size,omitempty"`
+	PaddingSize     string                  `json:"padding_size,omitempty"`
 	ALPN            Listable[string]        `json:"alpn,omitempty"`
 	MinVersion      string                  `json:"min_version,omitempty"`
 	MaxVersion      string                  `json:"max_version,omitempty"`