diff --git a/common/src/main/scala/net/psforever/packet/game/TrainingZoneMessage.scala b/common/src/main/scala/net/psforever/packet/game/TrainingZoneMessage.scala
index 21885a17..59367263 100644
--- a/common/src/main/scala/net/psforever/packet/game/TrainingZoneMessage.scala
+++ b/common/src/main/scala/net/psforever/packet/game/TrainingZoneMessage.scala
@@ -27,8 +27,10 @@ import scodec.codecs._
   * 21 - `15` - NC Vehicle Training Area<br>
   * 22 - `16` - VS Vehicle Training Area
   * @param zone the virtual reality zone to send the player
+  * @param unk na; always 0?
   */
-final case class TrainingZoneMessage(zone : Long)
+final case class TrainingZoneMessage(zone : PlanetSideGUID,
+                                     unk : Int = 0)
   extends PlanetSideGamePacket {
   type Packet = TrainingZoneMessage
   def opcode = GamePacketOpcode.TrainingZoneMessage
@@ -37,6 +39,7 @@ final case class TrainingZoneMessage(zone : Long)
 
 object TrainingZoneMessage extends Marshallable[TrainingZoneMessage] {
   implicit val codec : Codec[TrainingZoneMessage] = (
-      "zone" | uint32L
+    ("zone" | PlanetSideGUID.codec) ::
+      ("unk" | uint16L)
     ).as[TrainingZoneMessage]
 }
diff --git a/common/src/test/scala/GamePacketTest.scala b/common/src/test/scala/GamePacketTest.scala
index 3aab6ca3..04787b75 100644
--- a/common/src/test/scala/GamePacketTest.scala
+++ b/common/src/test/scala/GamePacketTest.scala
@@ -835,15 +835,15 @@ class GamePacketTest extends Specification {
 
       "decode" in {
         PacketCoding.DecodePacket(string).require match {
-          case TrainingZoneMessage(zone) =>
-            zone mustEqual 19
+          case TrainingZoneMessage(zone, unk) =>
+            zone mustEqual PlanetSideGUID(19)
           case default =>
             ko
         }
       }
 
       "encode" in {
-        val msg = TrainingZoneMessage(19)
+        val msg = TrainingZoneMessage(PlanetSideGUID(19))
         val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
 
         pkt mustEqual string