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-rw-r--r--src/mame/drivers/horizon.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/horizon.cpp b/src/mame/drivers/horizon.cpp
index caef58d53cb..d26c93061b0 100644
--- a/src/mame/drivers/horizon.cpp
+++ b/src/mame/drivers/horizon.cpp
@@ -220,7 +220,8 @@ MACHINE_CONFIG_START(horizon_state::horizon)
MCFG_SOFTWARE_LIST_ADD("flop_list", "horizon")
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(horizon_state::horizon2mhz, horizon)
+MACHINE_CONFIG_START(horizon_state::horizon2mhz)
+ horizon(config);
MCFG_CPU_MODIFY("z80")
MCFG_CPU_CLOCK(XTAL(4'000'000) / 2)