diff --git a/libmpcodecs/dec_audio.c b/libmpcodecs/dec_audio.c
index 1a06b85921..218203272d 100644
--- a/libmpcodecs/dec_audio.c
+++ b/libmpcodecs/dec_audio.c
@@ -154,7 +154,7 @@ static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
     }
     sh_audio->codec = NULL;
     while (1) {
-	ad_functions_t *mpadec;
+	const ad_functions_t *mpadec;
 	int i;
 	sh_audio->ad_driver = 0;
 	// restore original fourcc:
diff --git a/libmpdemux/stheader.h b/libmpdemux/stheader.h
index b11b886ce1..08db01f025 100644
--- a/libmpdemux/stheader.h
+++ b/libmpdemux/stheader.h
@@ -75,7 +75,7 @@ typedef struct sh_audio {
   int a_out_buffer_size;
 //  void* audio_out;        // the audio_out handle, used for this audio stream
   struct af_stream *afilter;          // the audio filter stream
-  struct ad_functions *ad_driver;
+  const struct ad_functions *ad_driver;
 #ifdef CONFIG_DYNAMIC_PLUGINS
   void *dec_handle;
 #endif