diff --git a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
index 174b3a02a..7c884f50c 100644
--- a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
+++ b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using UnityEngine;
 
 
@@ -9,8 +7,6 @@ namespace UniVRM10
     [Serializable]
     public class CurveMapper
     {
-        private AnimationCurve _curve = AnimationCurve.Linear(0, 0, 1.0f, 1.0f);
-
         [Range(20.0f, 90.0f)]
         public float CurveXRangeDegree;
 
@@ -51,8 +47,8 @@ namespace UniVRM10
                 {
                     src = CurveXRangeDegree;
                 }
-                return _curve.Evaluate(src / CurveXRangeDegree) * CurveYRangeDegree;
+                return src / CurveXRangeDegree * CurveYRangeDegree;
             }
         }
     }
-}
+}
\ No newline at end of file