--- nono/vm/pio.h	2026/04/29 17:04:42	1.1.1.4
+++ nono/vm/pio.h	2026/04/29 17:04:45	1.1.1.5
@@ -19,7 +19,7 @@ class i8255Device
 
  public:
 	i8255Device();
-	~i8255Device() override;
+	virtual ~i8255Device() override;
 
 	void ResetHard() override;
 
@@ -63,7 +63,7 @@ class PPIDevice
 
  public:
 	PPIDevice();
-	~PPIDevice() override;
+	virtual ~PPIDevice() override;
 
  protected:
 	// BusIO インタフェース
@@ -79,7 +79,7 @@ class PIO0Device
 	using inherited = i8255Device;
  public:
 	PIO0Device();
-	~PIO0Device() override;
+	virtual ~PIO0Device() override;
 
 	bool Init() override;
 
@@ -123,7 +123,7 @@ class PIO1Device
 	using inherited = i8255Device;
  public:
 	PIO1Device();
-	~PIO1Device() override;
+	virtual ~PIO1Device() override;
 
 	void ResetHard() override;