diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index ca7a6dcd11..2b3bbbe32a 100644
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -409,7 +409,7 @@ static int avi_write_header(AVFormatContext *s)
             parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
             put_le32(pb, au_scale); /* scale */
             put_le32(pb, au_byterate); /* rate */
-//            av_set_pts_info(&s->streams[i], 64, au_scale, au_byterate);
+            av_set_pts_info(&s->streams[i], 64, au_scale, au_byterate);
             put_le32(pb, 0); /* start */
             avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */
             put_le32(pb, 0); /* length, XXX: filled later */