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-rw-r--r--src/mame/drivers/nightgal.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/nightgal.cpp b/src/mame/drivers/nightgal.cpp
index 801e60a48b1..8a941df5353 100644
--- a/src/mame/drivers/nightgal.cpp
+++ b/src/mame/drivers/nightgal.cpp
@@ -799,7 +799,7 @@ void nightgal_state::royalqn(machine_config &config)
NSC8105(config, m_subcpu, MASTER_CLOCK / 8);
m_subcpu->set_addrmap(AS_PROGRAM, &nightgal_state::royalqn_nsc_map);
- config.m_perfect_cpu_quantum = subtag("maincpu");
+ config.set_perfect_quantum(m_maincpu);
JANGOU_BLITTER(config, m_blitter, MASTER_CLOCK/4);