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-rw-r--r--src/mame/drivers/welltris.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/welltris.cpp b/src/mame/drivers/welltris.cpp
index 7705bb44530..1d0319f5d62 100644
--- a/src/mame/drivers/welltris.cpp
+++ b/src/mame/drivers/welltris.cpp
@@ -712,7 +712,8 @@ MACHINE_CONFIG_START(welltris_state::welltris)
MCFG_SOUND_ROUTE(2, "mono", 0.75)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(welltris_state::quiz18k, welltris)
+MACHINE_CONFIG_START(welltris_state::quiz18k)
+ welltris(config);
/* basic machine hardware */