diff --git a/Editor/EditorGUIUtils.cs b/Editor/EditorGUIUtils.cs
index 2992c0b..7387879 100644
--- a/Editor/EditorGUIUtils.cs
+++ b/Editor/EditorGUIUtils.cs
@@ -17,14 +17,14 @@ public static void HorizontalLine(Color color)
 
         public static void HorizontalLine() => HorizontalLine(horizontalLineColor);
 
-        public class FoldoutHeaderScope : System.IDisposable
+        public struct FoldoutHeaderScope : System.IDisposable
         {
             public FoldoutHeaderScope(string label, ref bool foldout)
             {
                 foldout = EditorGUILayout.BeginFoldoutHeaderGroup(foldout, label);
             }
 
-            public void Dispose()
+            public readonly void Dispose()
             {
                 EditorGUILayout.EndFoldoutHeaderGroup();
             }