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-rw-r--r--src/mame/drivers/rbmk.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/rbmk.cpp b/src/mame/drivers/rbmk.cpp
index 80e331e5045..d3bc3b2deb6 100644
--- a/src/mame/drivers/rbmk.cpp
+++ b/src/mame/drivers/rbmk.cpp
@@ -599,7 +599,8 @@ MACHINE_CONFIG_START(rbmk_state::rbmk)
MCFG_SOUND_ROUTE(1, "rspeaker", 0.60)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(rbmk_state::rbspm, rbmk)
+MACHINE_CONFIG_START(rbmk_state::rbspm)
+ rbmk(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_PROGRAM_MAP(rbspm_mem)