diff --git a/nemu/src/device/audio.c b/nemu/src/device/audio.c
index f2cd05c..7263ae8 100644
--- a/nemu/src/device/audio.c
+++ b/nemu/src/device/audio.c
@@ -45,7 +45,7 @@ static void audio_callback(void *userdata, uint8_t *stream, int len) {
     // memcpy(stream, sbuf + pos_read, to_end_cnt);
     // memcpy(stream + to_end_cnt, sbuf, out_bound_cnt);
   } else {
-    // memcpy(stream, sbuf + pos_read, read_cnt);
+    memcpy(stream, sbuf + pos_read, read_cnt);
   }
   pos_read += read_cnt;
   pos_read %= CONFIG_SB_SIZE;