diff --git a/client/builders.go b/client/builders.go
index c3c292c5..e6c8bd15 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -222,7 +222,7 @@ func (c *QQClient) buildRequestTgtgtNopicsigPacket() (uint16, []byte) {
 		}))
 		w.Write(tlv.T147(16, []byte(c.version.SortVersionName), c.version.ApkSign))
 		w.Write(tlv.T177(c.version.BuildTime, c.version.SdkVersion))
-		w.Write(tlv.T400(c.g, c.Uin, SystemDeviceInfo.Guid, c.dpwd, 1, 16, c.t403))
+		w.Write(tlv.T400(c.g, c.Uin, SystemDeviceInfo.Guid, c.dpwd, 1, 16, c.randSeed))
 		w.Write(tlv.T187(SystemDeviceInfo.MacAddress))
 		w.Write(tlv.T188(SystemDeviceInfo.AndroidId))
 		w.Write(tlv.T194(SystemDeviceInfo.IMSIMd5))
diff --git a/client/client.go b/client/client.go
index f2c123d7..b91fab45 100644
--- a/client/client.go
+++ b/client/client.go
@@ -66,12 +66,12 @@ type QQClient struct {
 	t174             []byte
 	g                []byte
 	t402             []byte
-	t403             []byte
 	t150             []byte
 	t149             []byte
 	t528             []byte
 	t530             []byte
 	rollbackSig      []byte
+	randSeed         []byte // t403
 	timeDiff         int64
 	sigInfo          *loginSigInfo
 	highwaySession   *highwaySessionInfo
@@ -107,7 +107,6 @@ type loginSigInfo struct {
 
 	srmToken           []byte // study room manager | 0x16a
 	t133               []byte
-	randSeed           []byte
 	encryptedA1        []byte
 	userStKey          []byte
 	userStWebSig       []byte
diff --git a/client/decoders.go b/client/decoders.go
index 8d3a6137..d076e0dc 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -54,7 +54,7 @@ func decodeLoginResponse(c *QQClient, _ uint16, payload []byte) (interface{}, er
 			c.decodeT161(t161)
 		}
 		if m.Exists(0x403) {
-			c.t403 = m[0x403]
+			c.randSeed = m[0x403]
 		}
 		c.decodeT119(m[0x119])
 		return LoginResponse{
@@ -101,7 +101,7 @@ func decodeLoginResponse(c *QQClient, _ uint16, payload []byte) (interface{}, er
 		if t174, ok := m[0x174]; ok { // 短信验证
 			c.t104 = m[0x104]
 			c.t174 = t174
-			c.t403 = m[0x403]
+			c.randSeed = m[0x403]
 			phone := func() string {
 				r := binary.NewReader(m[0x178])
 				return r.ReadStringLimit(int(r.ReadInt32()))
@@ -150,7 +150,7 @@ func decodeLoginResponse(c *QQClient, _ uint16, payload []byte) (interface{}, er
 
 	if t == 204 {
 		c.t104 = m[0x104]
-		c.t403 = m[0x403]
+		c.randSeed = m[0x403]
 		return c.sendAndWait(c.buildDeviceLockLoginPacket())
 	} // drive lock