diff --git a/am/src/nemu/ioe/audio.c b/am/src/nemu/ioe/audio.c
index b648710..81839c4 100644
--- a/am/src/nemu/ioe/audio.c
+++ b/am/src/nemu/ioe/audio.c
@@ -8,6 +8,9 @@
 #define AUDIO_INIT_ADDR      (AUDIO_ADDR + 0x10)
 #define AUDIO_COUNT_ADDR     (AUDIO_ADDR + 0x14)
 
+void __am_audio_init() {
+}
+
 void __am_audio_config(AM_AUDIO_CONFIG_T *cfg) {
   cfg->present = false;
 }
diff --git a/am/src/nemu/ioe/ioe.c b/am/src/nemu/ioe/ioe.c
index 7468968..a7985fb 100644
--- a/am/src/nemu/ioe/ioe.c
+++ b/am/src/nemu/ioe/ioe.c
@@ -3,6 +3,7 @@
 
 void __am_timer_init();
 void __am_gpu_init();
+void __am_audio_init();
 void __am_input_keybrd(AM_INPUT_KEYBRD_T *);
 void __am_timer_rtc(AM_TIMER_RTC_T *);
 void __am_timer_uptime(AM_TIMER_UPTIME_T *);
@@ -46,6 +47,7 @@ bool ioe_init() {
     if (!lut[i]) lut[i] = fail;
   __am_gpu_init();
   __am_timer_init();
+  __am_audio_init();
   return true;
 }