diff --git a/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeBindingMerger.cs b/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeBindingMerger.cs
index 734d8c9e4..0dbfd1745 100644
--- a/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeBindingMerger.cs
+++ b/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeBindingMerger.cs
@@ -96,7 +96,8 @@ namespace VRM
                 float acc;
                 if (m_blendShapeValueMap.TryGetValue(binding, out acc))
                 {
-                    m_blendShapeValueMap[binding] = acc + binding.Weight * value;
+                    var accumulatedSum = acc + binding.Weight * value;
+                    m_blendShapeValueMap[binding] = Mathf.Clamp(accumulatedSum, 0.0f, 100.0f);
                 }
                 else
                 {