diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index a456b0b84..b5fa7922f 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -273,7 +273,7 @@ namespace UniVRM10
                         }
                         else
                         {
-                            radius = 0;
+                            radius = default;
                             return true;
                         }
                     }