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-rw-r--r--src/mame/drivers/thunderj.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/thunderj.cpp b/src/mame/drivers/thunderj.cpp
index 53403e0eaa3..99a39eeccac 100644
--- a/src/mame/drivers/thunderj.cpp
+++ b/src/mame/drivers/thunderj.cpp
@@ -255,7 +255,7 @@ void thunderj_state::thunderj(machine_config &config)
WATCHDOG_TIMER(config, "watchdog");
/* perfect synchronization due to shared RAM */
- config.m_perfect_cpu_quantum = subtag("maincpu");
+ config.set_perfect_quantum(m_maincpu);
/* video hardware */
GFXDECODE(config, "gfxdecode", "palette", gfx_thunderj);