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-rw-r--r--src/mame/drivers/esq1.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/esq1.cpp b/src/mame/drivers/esq1.cpp
index 5da25191d24..a07f82d9080 100644
--- a/src/mame/drivers/esq1.cpp
+++ b/src/mame/drivers/esq1.cpp
@@ -623,7 +623,8 @@ MACHINE_CONFIG_START(esq1_state::esq1)
MCFG_SOUND_ROUTE_EX(7, "filters", 1.0, 7)
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(esq1_state::sq80, esq1)
+MACHINE_CONFIG_START(esq1_state::sq80)
+ esq1(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_PROGRAM_MAP(sq80_map)