diff --git a/src/mess/machine/southbridge.c b/src/mess/machine/southbridge.c
index 9bfb25e4022..f657edd3afd 100644
--- a/src/mess/machine/southbridge.c
+++ b/src/mess/machine/southbridge.c
@@ -116,11 +116,11 @@ static MACHINE_CONFIG_FRAGMENT( southbridge )
 
 	MCFG_MC146818_IRQ_ADD("rtc", MC146818_STANDARD, DEVWRITELINE("pic8259_slave", pic8259_device, ir0_w))
 
-	MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide", ata_devices, "hdd", NULL, true)
+	MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide", ata_devices, "hdd", NULL, false)
 	MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir6_w))
 	MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM)
 
-	MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide2", ata_devices, "cdrom", NULL, true)
+	MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide2", ata_devices, "cdrom", NULL, false)
 	MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir7_w))
 	MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM)