diff --git a/libavformat/au.c b/libavformat/au.c
index c0780c73e2..6ce326f57a 100644
--- a/libavformat/au.c
+++ b/libavformat/au.c
@@ -163,6 +163,7 @@ static int au_read_packet(AVFormatContext *s,
     if (av_new_packet(pkt, MAX_SIZE))
         return AVERROR_IO;
     pkt->stream_index = 0;
+    pkt->flags |= PKT_FLAG_KEY;    
 
     ret = get_buffer(&s->pb, pkt->data, pkt->size);
     if (ret < 0)
diff --git a/libavformat/wav.c b/libavformat/wav.c
index 50d8593ff3..a85e9d6665 100644
--- a/libavformat/wav.c
+++ b/libavformat/wav.c
@@ -329,6 +329,7 @@ static int wav_read_packet(AVFormatContext *s,
     if (av_new_packet(pkt, size))
         return AVERROR_IO;
     pkt->stream_index = 0;
+    pkt->flags |= PKT_FLAG_KEY;    
 
     ret = get_buffer(&s->pb, pkt->data, pkt->size);
     if (ret < 0)