diff --git a/OpenSim/Region/ScriptEngine/Common/LSL_Types.cs b/OpenSim/Region/ScriptEngine/Common/LSL_Types.cs
index 1611b741d8..77ca769ac8 100644
--- a/OpenSim/Region/ScriptEngine/Common/LSL_Types.cs
+++ b/OpenSim/Region/ScriptEngine/Common/LSL_Types.cs
@@ -232,7 +232,7 @@ namespace OpenSim.Region.ScriptEngine.Common
 
             public static float Mag(Vector3 v)
             {
-                return (float)Math.Sqrt(v.x * v.y + v.y * v.y + v.z * v.z);
+                return (float)Math.Sqrt(v.x * v.x + v.y * v.y + v.z * v.z);
             }
 
             public static Vector3 Norm(Vector3 vector)