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-rw-r--r--src/emu/sound/disc_mth.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/sound/disc_mth.inc b/src/emu/sound/disc_mth.inc
index 8474d08f5e5..8b743cc0b9e 100644
--- a/src/emu/sound/disc_mth.inc
+++ b/src/emu/sound/disc_mth.inc
@@ -1435,7 +1435,7 @@ DISCRETE_RESET(dst_ramp)
{
m_v_out = DST_RAMP__CLAMP;
m_step = DST_RAMP__GRAD / this->sample_rate();
- m_dir = ((DST_RAMP__END - DST_RAMP__START) == abs(DST_RAMP__END - DST_RAMP__START));
+ m_dir = ((DST_RAMP__END - DST_RAMP__START) == fabs(DST_RAMP__END - DST_RAMP__START));
m_last_en = 0;
}