diff --git a/src/mame/drivers/mz2500.cpp b/src/mame/drivers/mz2500.cpp
index 0de63ed8a50..0b1308ca3a2 100644
--- a/src/mame/drivers/mz2500.cpp
+++ b/src/mame/drivers/mz2500.cpp
@@ -1674,7 +1674,8 @@ static INPUT_PORTS_START( mz2500 )
 
 	PORT_START("KEYD")
 	PORT_BIT(0x01,IP_ACTIVE_LOW,IPT_KEYBOARD) PORT_NAME("LOGO KEY")
-	PORT_BIT(0xfe,IP_ACTIVE_LOW,IPT_UNUSED)
+	PORT_BIT(0x02,IP_ACTIVE_LOW,IPT_KEYBOARD) PORT_NAME("HELP")
+	PORT_BIT(0xfc,IP_ACTIVE_LOW,IPT_UNUSED)
 
 	PORT_START("UNUSED")
 	PORT_BIT(0xff,IP_ACTIVE_LOW,IPT_UNUSED )