diff --git a/src/mame/drivers/galaxian.cpp b/src/mame/drivers/galaxian.cpp
index 7d197930baa..e908470b726 100644
--- a/src/mame/drivers/galaxian.cpp
+++ b/src/mame/drivers/galaxian.cpp
@@ -6434,7 +6434,9 @@ static INPUT_PORTS_START( sfx )
 	PORT_DIPSETTING(    0x00, DEF_STR( Upright ) )
 	PORT_DIPSETTING(    0x08, DEF_STR( Cocktail ) )
 	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
-	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )    /* unused */
+	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Demo_Sounds ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
 	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )    /* unused */