diff --git a/src/mame/drivers/tourvis.cpp b/src/mame/drivers/tourvis.cpp
index 626c73cb8de..21ea16d8104 100644
--- a/src/mame/drivers/tourvis.cpp
+++ b/src/mame/drivers/tourvis.cpp
@@ -562,7 +562,7 @@ MACHINE_CONFIG_END
 	ROMX_LOAD( "v4-43.ic29", 0x0000, 0x8000, CRC(88da23f3) SHA1(9d24faa116129783e55c7f79a4a08902a236d5a6), ROM_BIOS(5) ) \
 	ROM_SYSTEM_BIOS( 5, "40", "V4-40" ) \
 	ROMX_LOAD( "v4-40.ic29", 0x0000, 0x8000, CRC(ba6290cc) SHA1(92b0e9f55791e892ec209de4fadd80faef370622), ROM_BIOS(6) ) \
-	ROM_SYSTEM_BIOS( 6, "12", "V4-12" ) \
+	ROM_SYSTEM_BIOS( 6, "12", "V1-20" ) \
 	ROMX_LOAD( "v1_2.0.bin", 0x0000, 0x8000, CRC(36012f88) SHA1(5bd42fb51aa48ff65e704ea06a9181bb87ed2137), ROM_BIOS(7) )