diff --git a/src/emu/bus/midi/midioutport.h b/src/emu/bus/midi/midioutport.h
index 573eea5cc0f..95896744962 100644
--- a/src/emu/bus/midi/midioutport.h
+++ b/src/emu/bus/midi/midioutport.h
@@ -18,8 +18,8 @@ class midiout_port_device : public device_t,
 public:
 	midiout_port_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
 	virtual machine_config_constructor device_mconfig_additions() const;
-	DECLARE_WRITE_LINE_MEMBER( read ) { }
-	virtual void tx(UINT8 state) { m_midiout->tx(state); }
+
+	virtual DECLARE_WRITE_LINE_MEMBER( input_txd ) { if (m_midiout) m_midiout->tx(state); }
 
 protected:
 	virtual void device_start() { }