diff --git a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
index a2be36e4e..1e7109d2a 100644
--- a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
+++ b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
@@ -30,7 +30,7 @@ namespace UniVRM10
         public float Map(float src)
         {
             // https://github.com/vrm-c/UniVRM/issues/2452
-            var t = Mathf.Clamp01(Mathf.Clamp(src, 0, CurveXRangeDegree) / Mathf.Max(0.001f, CurveXRangeDegree));
+            var t = Mathf.Clamp01(src / Mathf.Max(0.001f, CurveXRangeDegree));
             return t * CurveYRangeDegree;
         }
     }