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-rw-r--r--src/mame/drivers/namcops2.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/namcops2.cpp b/src/mame/drivers/namcops2.cpp
index 2e960f54334..1187704922d 100644
--- a/src/mame/drivers/namcops2.cpp
+++ b/src/mame/drivers/namcops2.cpp
@@ -932,7 +932,8 @@ MACHINE_CONFIG_START(namcops2_state::system246)
MCFG_PALETTE_ADD("palette", 65536)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(namcops2_state::system256, system246)
+MACHINE_CONFIG_START(namcops2_state::system256)
+ system246(config);
MACHINE_CONFIG_END
#define SYSTEM246_BIOS \