diff --git a/client/builders.go b/client/builders.go
index 0e183c6e..4d036203 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -36,7 +36,7 @@ func (c *QQClient) buildLoginPacket() (uint16, []byte) {
 	seq := c.nextSeq()
 	req := packets.BuildOicqRequestPacket(c.Uin, 0x0810, crypto.ECDH, c.RandomKey, func(w *binary.Writer) {
 		w.WriteUInt16(9)
-		w.WriteUInt16(17)
+		w.WriteUInt16(0x17)
 
 		w.Write(tlv.T18(16, uint32(c.Uin)))
 		w.Write(tlv.T1(uint32(c.Uin), SystemDeviceInfo.IpAddress))
diff --git a/client/decoders.go b/client/decoders.go
index f1a66438..baa19a37 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -56,8 +56,9 @@ func decodeLoginResponse(c *QQClient, _ uint16, payload []byte) (interface{}, er
 		c.t104, _ = m[0x104]
 		if m.Exists(0x192) { // slider, not supported yet
 			return LoginResponse{
-				Success: false,
-				Error:   UnknownLoginError,
+				Success:   false,
+				VerifyUrl: string(m[0x192]),
+				Error:     SliderNeededError,
 			}, nil
 		}
 		if m.Exists(0x165) { // image
diff --git a/client/entities.go b/client/entities.go
index ecb35898..1611e31e 100644
--- a/client/entities.go
+++ b/client/entities.go
@@ -255,6 +255,7 @@ const (
 	SNSNeededError         LoginError = 5
 	TooManySNSRequestError LoginError = 6
 	SNSOrVerifyNeededError LoginError = 7
+	SliderNeededError      LoginError = 8
 	UnknownLoginError      LoginError = -1
 
 	Owner MemberPermission = iota