diff --git a/App.xaml.cs b/App.xaml.cs
index f74b6fd..0cee0c7 100644
--- a/App.xaml.cs
+++ b/App.xaml.cs
@@ -56,12 +56,8 @@ private App()
 
         var engineServer = new EngineServer(Settings.Default.EnginePort);
 
-        var contextMenuStrip = new ContextMenuStrip()
-        {
-            Renderer = new VolumeIconRenderer(),
-        };
-        var menuItems = contextMenuStrip.Items;
-        menuItems.Add(new ToolStripMenuItem("終了", image: null, (sender, e) => this.Shutdown()));
+        var contextMenuStrip = new ContextMenuStrip();
+        contextMenuStrip.Items.Add("終了", image: null, (sender, e) => this.Shutdown());
 
         var notifyIcon = new NotifyIcon()
         {
diff --git a/VolumeIconRenderer.cs b/VolumeIconRenderer.cs
deleted file mode 100644
index 0882641..0000000
--- a/VolumeIconRenderer.cs
+++ /dev/null
@@ -1,36 +0,0 @@
-using System;
-using System.Drawing;
-using System.IO;
-using System.Linq;
-using System.Windows.Forms;
-
-namespace Esperecyan.NCVVoicevox;
-
-/// <summary>
-/// 「volume」という名前の項目に、スピーカーアイコンを表示します。
-/// </summary>
-internal class VolumeIconRenderer : ToolStripProfessionalRenderer
-{
-    private static readonly int Size = 24;
-    private static readonly Icon Icon;
-
-    static VolumeIconRenderer()
-    {
-        VolumeIconRenderer.Icon = IconExtractor.ExtractFromFile(
-            Path.Join(Environment.GetFolderPath(Environment.SpecialFolder.SystemX86), "DDORes.dll"),
-            index: 1
-        );
-    }
-
-    protected override void OnRenderImageMargin(ToolStripRenderEventArgs e)
-    {
-        base.OnRenderImageMargin(e);
-        var volumeItem = e.ToolStrip.Items.Cast<ToolStripItem>().First(item => item.Name == "volume");
-        e.Graphics.DrawIcon(VolumeIconRenderer.Icon, new Rectangle(
-            x: 1,
-            y: volumeItem.Bounds.Y + volumeItem.Height / 2 - VolumeIconRenderer.Size / 2,
-            width: VolumeIconRenderer.Size,
-            height: VolumeIconRenderer.Size
-        ));
-    }
-}