diff --git a/NEWS b/NEWS
index c316360e8..520edc7ef 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.24.1 (not yet released)
+* output
+  - sndio: fix rounding error in volume calculation
 
 ver 0.24 (2025/03/11)
 * protocol
diff --git a/src/output/plugins/SndioOutputPlugin.cxx b/src/output/plugins/SndioOutputPlugin.cxx
index 1ca877668..b8e76f4f8 100644
--- a/src/output/plugins/SndioOutputPlugin.cxx
+++ b/src/output/plugins/SndioOutputPlugin.cxx
@@ -139,12 +139,12 @@ SndioOutput::Play(std::span<const std::byte> src)
 void
 SndioOutput::SetVolume(unsigned int volume)
 {
-	sio_setvol(hdl, volume * SIO_MAXVOL / 100);
+	sio_setvol(hdl, (volume * SIO_MAXVOL + 50) / 100);
 }
 
 static inline unsigned int
 RawToPercent(int raw_volume) {
-	return raw_volume < 0 ? 100 : raw_volume * 100 / SIO_MAXVOL;
+	return raw_volume < 0 ? 100 : (raw_volume * 100 + SIO_MAXVOL / 2) / SIO_MAXVOL;
 }
 
 void