diff --git a/libavformat/rtpdec_vp8.c b/libavformat/rtpdec_vp8.c
index b4b4f2207d..e756bf45bc 100644
--- a/libavformat/rtpdec_vp8.c
+++ b/libavformat/rtpdec_vp8.c
@@ -261,6 +261,8 @@ static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
             return ret;
         if (vp8->sequence_dirty)
             pkt->flags |= AV_PKT_FLAG_CORRUPT;
+        if (vp8->is_keyframe)
+            pkt->flags |= AV_PKT_FLAG_KEY;
         return 0;
     }