diff --git a/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs b/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
index 2d1b02d244..3778c09f6f 100644
--- a/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
+++ b/OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs
@@ -3280,7 +3280,7 @@ namespace OpenSim.Region.ScriptEngine.Common
 
             if(index < 0)
             {
-                index = index+src.Length;
+                index = index+dest.Length;
                 if(index < 0)
                 {
                     index = 0;