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-rw-r--r--src/mame/drivers/b2m.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/b2m.cpp b/src/mame/drivers/b2m.cpp
index 0333e529306..31dfd5e7aa0 100644
--- a/src/mame/drivers/b2m.cpp
+++ b/src/mame/drivers/b2m.cpp
@@ -251,7 +251,8 @@ MACHINE_CONFIG_START(b2m_state::b2m)
MCFG_RAM_DEFAULT_VALUE(0x00)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(b2m_state::b2mrom, b2m)
+MACHINE_CONFIG_START(b2m_state::b2mrom)
+ b2m(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_IO_MAP(b2m_rom_io)
MACHINE_CONFIG_END