diff --git a/Messages.cs b/Messages.cs
index dc85d1a..5a6c43d 100644
--- a/Messages.cs
+++ b/Messages.cs
@@ -307,14 +307,14 @@ namespace Passer.Control {
         public ModelUrlMsg(byte[] buffer) : base(buffer) { }
 
         public override byte[] Serialize() {
-            byte[] buffer = new byte[this.url.Length + 5];
+            byte[] buffer = new byte[this.url.Length + 6];
             byte ix = 0;
             buffer[ix++] = ModelUrlMsg.Id;
             buffer[ix++] = this.networkId;
             buffer[ix++] = this.thingId; // Thing Id
             LowLevelMessages.SendFloat16(buffer, ref ix, new float16(1.0f));
 
-            buffer[8] = (byte)url.Length;
+            buffer[ix++] = (byte)url.Length;
             for (int urlIx = 0; urlIx < this.url.Length; urlIx++, ix++)
                 buffer[ix] = (byte)url[urlIx];
             return buffer;
@@ -323,7 +323,6 @@ namespace Passer.Control {
             byte ix = 0;
             this.networkId = buffer[ix++];
             this.thingId = buffer[ix++];
-            //this.position = LowLevelMessages.ReceiveSpherical(data, ref ix);
             this.scale = LowLevelMessages.ReceiveFloat16(buffer, ref ix);
             int strlen = buffer[ix++];
             url = System.Text.Encoding.UTF8.GetString(buffer, (int)ix, strlen);