diff --git a/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeKey.cs b/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeKey.cs
index fa19b13e5..344904f21 100644
--- a/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeKey.cs
+++ b/Assets/VRM/UniVRM/Scripts/BlendShape/BlendShapeKey.cs
@@ -103,7 +103,7 @@ namespace VRM
 
         public override string ToString()
         {
-            return m_id.Replace(UnknownPresetPrefix, "").ToUpper();
+            return m_id.Replace(UnknownPresetPrefix, "");
         }
 
         public bool Equals(BlendShapeKey other)