diff --git a/proxy/shadowsocks/config.go b/proxy/shadowsocks/config.go
index ef592a2fa..4b228c6a2 100644
--- a/proxy/shadowsocks/config.go
+++ b/proxy/shadowsocks/config.go
@@ -31,7 +31,7 @@ func (v *Account) GetCipher() (Cipher, error) {
 		return &AesCfb{KeyBytes: 32}, nil
 	case CipherType_CHACHA20:
 		return &ChaCha20{IVBytes: 8}, nil
-	case CipherType_CHACHA20_IEFT:
+	case CipherType_CHACHA20_IETF:
 		return &ChaCha20{IVBytes: 12}, nil
 	default:
 		return nil, errors.New("Unsupported cipher.")
diff --git a/proxy/shadowsocks/config.pb.go b/proxy/shadowsocks/config.pb.go
index 16bf92751..6cb904740 100644
--- a/proxy/shadowsocks/config.pb.go
+++ b/proxy/shadowsocks/config.pb.go
@@ -39,7 +39,7 @@ const (
 	CipherType_AES_128_CFB   CipherType = 1
 	CipherType_AES_256_CFB   CipherType = 2
 	CipherType_CHACHA20      CipherType = 3
-	CipherType_CHACHA20_IEFT CipherType = 4
+	CipherType_CHACHA20_IETF CipherType = 4
 )
 
 var CipherType_name = map[int32]string{
@@ -47,14 +47,14 @@ var CipherType_name = map[int32]string{
 	1: "AES_128_CFB",
 	2: "AES_256_CFB",
 	3: "CHACHA20",
-	4: "CHACHA20_IEFT",
+	4: "CHACHA20_IETF",
 }
 var CipherType_value = map[string]int32{
 	"UNKNOWN":       0,
 	"AES_128_CFB":   1,
 	"AES_256_CFB":   2,
 	"CHACHA20":      3,
-	"CHACHA20_IEFT": 4,
+	"CHACHA20_IETF": 4,
 }
 
 func (x CipherType) String() string {
@@ -194,8 +194,8 @@ var fileDescriptor0 = []byte{
 	0x36, 0xcc, 0x93, 0xaf, 0x00, 0x8f, 0x6d, 0x36, 0xa9, 0x6e, 0xe6, 0x1f, 0xe6, 0x57, 0x9f, 0xe6,
 	0xee, 0x01, 0x7d, 0x0a, 0x24, 0x98, 0x2d, 0xe2, 0x33, 0xfe, 0x2e, 0x0e, 0xcf, 0xa7, 0xae, 0xb3,
 	0x5d, 0xf0, 0x37, 0x6f, 0xed, 0xa2, 0xd3, 0x54, 0x12, 0x5e, 0x04, 0xe1, 0x45, 0xc0, 0x4f, 0xdd,
-	0x2e, 0x7d, 0x06, 0xff, 0x6f, 0xa7, 0xf8, 0x72, 0x76, 0xbe, 0x74, 0x7b, 0xd3, 0x2f, 0xe0, 0x09,
+	0x2e, 0x7d, 0x06, 0xff, 0x6f, 0xa7, 0xf8, 0x72, 0xb6, 0x3c, 0x77, 0x7b, 0xd3, 0x2f, 0xe0, 0x09,
 	0xcc, 0xf7, 0xbe, 0xc4, 0x94, 0xb4, 0x69, 0xae, 0x1b, 0xa3, 0x9f, 0xc9, 0xce, 0xe5, 0x57, 0xe7,
 	0xf8, 0x23, 0x8f, 0x92, 0x9a, 0x85, 0x0d, 0xf1, 0xda, 0x12, 0x17, 0x8f, 0xe7, 0xdb, 0x43, 0x9b,
-	0xed, 0xd5, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x80, 0xb9, 0x5c, 0xee, 0x14, 0x03, 0x00, 0x00,
+	0xed, 0xd5, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x1b, 0x4e, 0xca, 0xdc, 0x14, 0x03, 0x00, 0x00,
 }
diff --git a/proxy/shadowsocks/config.proto b/proxy/shadowsocks/config.proto
index 295729583..e85dbe14a 100644
--- a/proxy/shadowsocks/config.proto
+++ b/proxy/shadowsocks/config.proto
@@ -25,7 +25,7 @@ enum CipherType {
   AES_128_CFB = 1;
   AES_256_CFB = 2;
   CHACHA20 = 3;
-  CHACHA20_IEFT = 4;
+  CHACHA20_IETF = 4;
 }
 
 message ServerConfig {
diff --git a/proxy/shadowsocks/protocol_test.go b/proxy/shadowsocks/protocol_test.go
index cfb436707..7d1ee6ff8 100644
--- a/proxy/shadowsocks/protocol_test.go
+++ b/proxy/shadowsocks/protocol_test.go
@@ -84,7 +84,7 @@ func TestUDPReaderWriter(t *testing.T) {
 	user := &protocol.User{
 		Account: serial.ToTypedMessage(&Account{
 			Password:   "test-password",
-			CipherType: CipherType_CHACHA20_IEFT,
+			CipherType: CipherType_CHACHA20_IETF,
 		}),
 	}
 	cache := buf.New()
diff --git a/tools/conf/shadowsocks.go b/tools/conf/shadowsocks.go
index 476f40426..47788909e 100644
--- a/tools/conf/shadowsocks.go
+++ b/tools/conf/shadowsocks.go
@@ -2,6 +2,7 @@ package conf
 
 import (
 	"strings"
+
 	"v2ray.com/core/common/errors"
 	"v2ray.com/core/common/protocol"
 	"v2ray.com/core/common/serial"
@@ -44,7 +45,7 @@ func (v *ShadowsocksServerConfig) Build() (*serial.TypedMessage, error) {
 	case "chacha20":
 		account.CipherType = shadowsocks.CipherType_CHACHA20
 	case "chacha20-ietf":
-		account.CipherType = shadowsocks.CipherType_CHACHA20_IEFT
+		account.CipherType = shadowsocks.CipherType_CHACHA20_IETF
 	default:
 		return nil, errors.New("Unknown cipher method: " + cipher)
 	}
@@ -105,7 +106,7 @@ func (v *ShadowsocksClientConfig) Build() (*serial.TypedMessage, error) {
 		case "chacha20":
 			account.CipherType = shadowsocks.CipherType_CHACHA20
 		case "chacha20-ietf":
-			account.CipherType = shadowsocks.CipherType_CHACHA20_IEFT
+			account.CipherType = shadowsocks.CipherType_CHACHA20_IETF
 		default:
 			return nil, errors.New("Unknown cipher method: " + cipher)
 		}