diff --git a/Editor/Inspector/ShapeChanger/AddShapePopup.cs b/Editor/Inspector/ShapeChanger/AddShapePopup.cs
index a9ac4882..746d7b88 100644
--- a/Editor/Inspector/ShapeChanger/AddShapePopup.cs
+++ b/Editor/Inspector/ShapeChanger/AddShapePopup.cs
@@ -82,6 +82,8 @@ namespace nadena.dev.modular_avatar.core.editor.ShapeChanger
                 ChangeType = ShapeChangeType.Delete,
                 Value = 100
             });
+
+            PrefabUtility.RecordPrefabInstancePropertyModifications(changer);
         }
 
         public override void OnGUI(Rect rect)
diff --git a/Editor/Inspector/ShapeChanger/ShapeChangerEditor.cs b/Editor/Inspector/ShapeChanger/ShapeChangerEditor.cs
index 8451320e..1ddc7f6e 100644
--- a/Editor/Inspector/ShapeChanger/ShapeChangerEditor.cs
+++ b/Editor/Inspector/ShapeChanger/ShapeChangerEditor.cs
@@ -97,6 +97,8 @@ namespace nadena.dev.modular_avatar.core.editor.ShapeChanger
                 ChangeType = ShapeChangeType.Delete,
                 Value = 100
             });
+
+            PrefabUtility.RecordPrefabInstancePropertyModifications(changer);
         }
     }
 }
\ No newline at end of file