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-rw-r--r--src/mame/drivers/opwolf.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/opwolf.cpp b/src/mame/drivers/opwolf.cpp
index 43ba692da7c..4a731de13de 100644
--- a/src/mame/drivers/opwolf.cpp
+++ b/src/mame/drivers/opwolf.cpp
@@ -838,7 +838,8 @@ MACHINE_CONFIG_START(opwolf_state::opwolf)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(opwolf_state::opwolfp, opwolf)
+MACHINE_CONFIG_START(opwolf_state::opwolfp)
+ opwolf(config);
/* basic machine hardware */
MCFG_CPU_MODIFY("maincpu") /* 8 MHz */