diff --git a/src/mame/drivers/eolith.c b/src/mame/drivers/eolith.c
index fd9722018e3..946735c1b75 100644
--- a/src/mame/drivers/eolith.c
+++ b/src/mame/drivers/eolith.c
@@ -368,9 +368,9 @@ static INPUT_PORTS_START( ironfort )
 	PORT_DIPNAME( 0x00000001, 0x00000001, "Show Dip-switch Information" ) PORT_DIPLOCATION("SW4:1")
 	PORT_DIPSETTING(          0x00000001, DEF_STR( Off ) )
 	PORT_DIPSETTING(          0x00000000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x00000002, 0x00000000, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW4:2")
-	PORT_DIPSETTING(          0x00000002, DEF_STR( Off ) )
-	PORT_DIPSETTING(          0x00000000, DEF_STR( On ) )
+	PORT_DIPNAME( 0x00000002, 0x00000002, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW4:2")
+	PORT_DIPSETTING(          0x00000000, DEF_STR( Off ) )
+	PORT_DIPSETTING(          0x00000002, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0000000c, 0x0000000c, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW4:3,4")
 	PORT_DIPSETTING(          0x00000008, "1" )
 	PORT_DIPSETTING(          0x00000004, "2" )