diff --git a/src/mame/drivers/dreambal.c b/src/mame/drivers/dreambal.c
index bb5b9592bae..4e333cbe65e 100644
--- a/src/mame/drivers/dreambal.c
+++ b/src/mame/drivers/dreambal.c
@@ -161,9 +161,7 @@ static INPUT_PORTS_START( dreambal )
 	PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_START1) PORT_NAME("Start / Proceed")
 	PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_POKER_HOLD2 ) PORT_NAME("Hold 2 / Big")
 	PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_POKER_HOLD4 ) PORT_NAME("Hold 4")
-	PORT_DIPNAME( 0x2000, 0x2000, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(      0x2000, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
+	PORT_SERVICE( 0x2000, IP_ACTIVE_LOW ) // only works if there are 0 credits
 	PORT_DIPNAME( 0x4000, 0x4000, DEF_STR( Unknown ) )
 	PORT_DIPSETTING(      0x4000, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )