diff --git a/libsecondlife/Simulator.cs b/libsecondlife/Simulator.cs
index 1992b41e..57338f4f 100644
--- a/libsecondlife/Simulator.cs
+++ b/libsecondlife/Simulator.cs
@@ -311,9 +311,9 @@ namespace libsecondlife
         /// <summary>Coarse locations of avatars in this simulator</summary>
         internal List<LLVector3> avatarPositions = new List<LLVector3>();
         /// <summary>AvatarPositions index representing your avatar</summary>
-        internal int positionIndexYou;
+        internal int positionIndexYou = -1;
         /// <summary>AvatarPositions index representing TrackAgent target</summary>
-        internal int positionIndexPrey;
+        internal int positionIndexPrey = -1;
         /// <summary>Sequence numbers of packets we've finished processing 
         /// (for duplicate checking)</summary>
         internal Queue<uint> PacketArchive;