diff --git a/src/devices/bus/a2bus/a2hsscsi.h b/src/devices/bus/a2bus/a2hsscsi.h
index a660dac5e58..905de8b620d 100644
--- a/src/devices/bus/a2bus/a2hsscsi.h
+++ b/src/devices/bus/a2bus/a2hsscsi.h
@@ -28,6 +28,8 @@ public:
 	// construction/destruction
 	a2bus_hsscsi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
+	static constexpr feature_type unemulated_features() { return feature::DISK; }
+
 	DECLARE_WRITE_LINE_MEMBER( drq_w );
 
 protected: