diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index f24f697ada..3161e68c6c 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -642,4 +642,5 @@ AVInputFormat ogg_demuxer = {
     ogg_read_timestamp,
     .extensions = "ogg",
     .metadata_conv = ff_vorbiscomment_metadata_conv,
+    .flags = AVFMT_GENERIC_INDEX,
 };