diff --git a/abstract-machine/am/src/platform/nemu/ioe/audio.c b/abstract-machine/am/src/platform/nemu/ioe/audio.c
index 97dd06e..21e0035 100644
--- a/abstract-machine/am/src/platform/nemu/ioe/audio.c
+++ b/abstract-machine/am/src/platform/nemu/ioe/audio.c
@@ -40,9 +40,9 @@ void __am_audio_play(AM_AUDIO_PLAY_T *ctl) {
       i--;
       continue;
     } else {
+      outb(AUDIO_SBUF_ADDR + audio_write, ((uint8_t*)ctl->buf.start)[i]);
+      audio_write = (audio_write + 1) % audio_sbuf_size;
       outl(AUDIO_COUNT_ADDR, inl(AUDIO_COUNT_ADDR) + 1);
     }
-    outb(AUDIO_SBUF_ADDR + audio_write, ((uint8_t*)ctl->buf.start)[i]);
-    audio_write = (audio_write + 1) % audio_sbuf_size;
   }
 }