diff --git a/src/emu/bus/kc/d004.h b/src/emu/bus/kc/d004.h
index c929fd8ec4d..6f120ecfe71 100644
--- a/src/emu/bus/kc/d004.h
+++ b/src/emu/bus/kc/d004.h
@@ -71,7 +71,7 @@ private:
 	emu_timer *         m_reset_timer;
 
 	UINT8 *             m_rom;
-	UINT8               m_hw_input_gate;
+	//UINT8               m_hw_input_gate;
 	UINT16              m_rom_base;
 	UINT8               m_enabled;
 	UINT8               m_connected;