diff --git a/audio_ao.c b/audio_ao.c
index 3b58ca7c..9c87f892 100644
--- a/audio_ao.c
+++ b/audio_ao.c
@@ -121,7 +121,7 @@ static void deinit(void) {
 static void start(__attribute__((unused)) int sample_rate,
                   __attribute__((unused)) int sample_format) {}
 
-static void play(short buf[], int samples) { ao_play(dev, (char *)buf, samples * 4); }
+static void play(void * buf, int samples) { ao_play(dev, buf, samples * 4); }
 
 static void stop(void) {}