diff --git a/audio_ao.c b/audio_ao.c
index 1c5f913e..9ed0e288 100644
--- a/audio_ao.c
+++ b/audio_ao.c
@@ -124,6 +124,8 @@ audio_output audio_ao = {
     .deinit = &deinit,
     .start = &start,
     .stop = &stop,
+    .flush = NULL,
+    .delay = NULL,
     .play = &play,
     .volume = NULL
 };