diff --git a/src/mame/drivers/meritm.c b/src/mame/drivers/meritm.c
index 27c931cb5da..a46ca4d1b69 100644
--- a/src/mame/drivers/meritm.c
+++ b/src/mame/drivers/meritm.c
@@ -729,7 +729,6 @@ static INPUT_PORTS_START(americna)
 	PORT_DIPNAME( 0x10, 0x10, "Points Per Coin" ) PORT_DIPLOCATION("SW1:5")
 	PORT_DIPSETTING(    0x10, "1 Point / Coin" )
 	PORT_DIPSETTING(    0x00, "5 Points / Coin" )
-	PORT_DIPUNKNOWN_DIPLOC( 0x20, IP_ACTIVE_LOW, "SW1:6" )
 	PORT_DIPNAME( 0xc0, 0xc0, "Max Play" )       PORT_DIPLOCATION("SW1:7,8")
 	PORT_DIPSETTING(    0x40, "10" )
 	PORT_DIPSETTING(    0xc0, "20" )