diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index b299541147..0ae550366a 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -3492,7 +3492,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                                         return LSL_Key.NullKey;
                                     pos += m_host.GetWorldPosition();
                                 }
-                                else if ((pos + m_host.GetWorldPosition()).LengthSquared() > m_Script10mDistanceSquare)
+                                else if ((pos - m_host.GetWorldPosition()).LengthSquared() > m_Script10mDistanceSquare)
                                     return LSL_Key.NullKey;
 
                                 break;