--- nono/host/comdriver_none.h	2026/04/29 17:05:11	1.1.1.1
+++ nono/host/comdriver_none.h	2026/04/29 17:05:30	1.1.1.2
@@ -16,7 +16,7 @@ class COMDriverNone : public COMDriver
 {
 	using inherited = COMDriver;
  public:
-	COMDriverNone(HostDevice *hostdev_);
+	explicit COMDriverNone(HostDevice *hostdev_);
 	~COMDriverNone() override;
 
 	int Read() override;