diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 47d1cd79c6..3d4ce2dcd3 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -4070,7 +4070,7 @@ AVOutputFormat ff_ipod_muxer = {
     .write_header      = mov_write_header,
     .write_packet      = mov_write_packet,
     .write_trailer     = mov_write_trailer,
-    .flags             = AVFMT_GLOBALHEADER | AVFMT_ALLOW_FLUSH,
+    .flags             = AVFMT_GLOBALHEADER | AVFMT_ALLOW_FLUSH | AVFMT_TS_NEGATIVE,
     .codec_tag         = (const AVCodecTag* const []){ codec_ipod_tags, 0 },
     .priv_class        = &ipod_muxer_class,
 };