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-rw-r--r--src/mame/zenith/z100.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/zenith/z100.cpp b/src/mame/zenith/z100.cpp
index 52b5313a38c..882400127ee 100644
--- a/src/mame/zenith/z100.cpp
+++ b/src/mame/zenith/z100.cpp
@@ -784,7 +784,7 @@ void z100_state::z100(machine_config &config)
m_keybeep->out_cb().set(FUNC(z100_state::beep_update));
SPEAKER(config, "mono").front_center();
- BEEP(config, m_beeper, 1'000'000'000 / PERIOD_OF_555_ASTABLE_NSEC(RES_K(470), RES_K(470), CAP_U(.001)));
+ BEEP(config, m_beeper, XTAL::u(1'000'000'000) / PERIOD_OF_555_ASTABLE_NSEC(RES_K(470), RES_K(470), CAP_U(.001)));
m_beeper->add_route(ALL_OUTPUTS, "mono", 0.50);
/* video hardware */