diff --git a/src/mame/drivers/chihiro.c b/src/mame/drivers/chihiro.c
index 09e98017f5a..40b81fc6239 100644
--- a/src/mame/drivers/chihiro.c
+++ b/src/mame/drivers/chihiro.c
@@ -1145,7 +1145,7 @@ static MACHINE_CONFIG_START( chihiro_base, driver_device )
 MACHINE_CONFIG_END
 
 static MACHINE_CONFIG_DERIVED( chihirogd, chihiro_base )
-	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", "gdrom", "pic", NULL, "maincpu", NULL)
+	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", ":gdrom", "pic", NULL, "maincpu", NULL)
 MACHINE_CONFIG_END
 
 #define ROM_LOAD16_WORD_SWAP_BIOS(bios,name,offset,length,hash) \
diff --git a/src/mame/drivers/naomi.c b/src/mame/drivers/naomi.c
index 3cb710ad201..f0944496662 100644
--- a/src/mame/drivers/naomi.c
+++ b/src/mame/drivers/naomi.c
@@ -2560,7 +2560,7 @@ MACHINE_CONFIG_END
  */
 
 static MACHINE_CONFIG_DERIVED( naomigd, naomi_base )
-	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", "gdrom", "pic", "naomibd_eeprom", "maincpu", naomi_g1_irq)
+	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", ":gdrom", "pic", "naomibd_eeprom", "maincpu", naomi_g1_irq)
 MACHINE_CONFIG_END
 
 /*
diff --git a/src/mame/drivers/triforce.c b/src/mame/drivers/triforce.c
index 7354600c335..7c837cfcc36 100644
--- a/src/mame/drivers/triforce.c
+++ b/src/mame/drivers/triforce.c
@@ -447,7 +447,7 @@ static MACHINE_CONFIG_START( triforce_base, driver_device )
 MACHINE_CONFIG_END
 
 static MACHINE_CONFIG_DERIVED( triforcegd, triforce_base )
-	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", "gdrom", "picreturn", NULL, "maincpu", NULL)
+	MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", ":gdrom", "picreturn", NULL, "maincpu", NULL)
 MACHINE_CONFIG_END
 
 #define ROM_LOAD16_WORD_SWAP_BIOS(bios,name,offset,length,hash) \