diff --git a/src/mame/drivers/m90.c b/src/mame/drivers/m90.c
index a3499c98609..b7021e81f16 100644
--- a/src/mame/drivers/m90.c
+++ b/src/mame/drivers/m90.c
@@ -673,8 +673,8 @@ static INPUT_PORTS_START( riskchal )
 	PORT_DIPSETTING(      0x0010, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0020, 0x0020, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:6") /* Manual says "NOT USE" */
-	PORT_DIPSETTING(      0x0000, DEF_STR( No ) )
-	PORT_DIPSETTING(      0x0020, DEF_STR( Yes ) )
+	PORT_DIPSETTING(      0x0020, DEF_STR( Off ) )
+	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0040, 0x0000, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW1:7")
 	PORT_DIPSETTING(      0x0040, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )