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-rw-r--r--src/mame/audio/spacefb.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/audio/spacefb.cpp b/src/mame/audio/spacefb.cpp
index c8e139ac583..a6e3055d130 100644
--- a/src/mame/audio/spacefb.cpp
+++ b/src/mame/audio/spacefb.cpp
@@ -82,6 +82,7 @@ void spacefb_state::spacefb_audio(machine_config &config)
SPEAKER(config, "speaker").front_center();
DAC_8BIT_R2R(config, "dac", 0).add_route(ALL_OUTPUTS, "speaker", 0.25); // unknown DAC
voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref", 0));
+ vref.set_output(5.0);
vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);