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-rw-r--r--src/mame/drivers/cninja.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/cninja.cpp b/src/mame/drivers/cninja.cpp
index f59d03ae22f..ac39fdccd06 100644
--- a/src/mame/drivers/cninja.cpp
+++ b/src/mame/drivers/cninja.cpp
@@ -984,7 +984,8 @@ MACHINE_CONFIG_START(cninja_state::stoneage)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.75)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(cninja_state::cninjabl2, stoneage)
+MACHINE_CONFIG_START(cninja_state::cninjabl2)
+ stoneage(config);
MCFG_CPU_MODIFY("audiocpu")
MCFG_CPU_PROGRAM_MAP(cninjabl2_s_map)