diff --git a/audio/out/ao_pulse.c b/audio/out/ao_pulse.c
index d553b6700c..fc0dd0d008 100644
--- a/audio/out/ao_pulse.c
+++ b/audio/out/ao_pulse.c
@@ -23,6 +23,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <stdint.h>
+#include <math.h>
 #include <pthread.h>
 
 #include <pulse/pulseaudio.h>
@@ -34,8 +35,8 @@
 #include "ao.h"
 #include "internal.h"
 
-#define VOL_PA2MP(v) ((v) * 100 / PA_VOLUME_NORM)
-#define VOL_MP2PA(v) ((v) * PA_VOLUME_NORM / 100)
+#define VOL_PA2MP(v) ((v) * 100.0 / PA_VOLUME_NORM)
+#define VOL_MP2PA(v) lrint((v) * PA_VOLUME_NORM / 100)
 
 struct priv {
     // PulseAudio playback stream object