diff --git a/GServer.Common/Networking/Messages/Client/AuthResponseMessage.cs b/GServer.Common/Networking/Messages/Client/AuthResponseMessage.cs
index 3d4668d..60fb5b6 100644
--- a/GServer.Common/Networking/Messages/Client/AuthResponseMessage.cs
+++ b/GServer.Common/Networking/Messages/Client/AuthResponseMessage.cs
@@ -56,7 +56,7 @@ public class AuthResponseMessage : BaseMessage, IMessage<AuthResponseMessage>
         if (IsSuccessful)
         {
             short sessionTokenByteLen = (short)Encoding.UTF8.GetByteCount(SessionToken!);
-            stream.WriteUInt16(sessionTokenByteLen);
+            stream.WriteInt16(sessionTokenByteLen);
             stream.WriteUtf8String(SessionToken!);
         }
         else