diff --git a/libavformat/ivfdec.c b/libavformat/ivfdec.c
index 40ae464b76..4a802573e7 100644
--- a/libavformat/ivfdec.c
+++ b/libavformat/ivfdec.c
@@ -53,7 +53,8 @@ static int read_header(AVFormatContext *s)
     st->codecpar->height     = avio_rl16(s->pb);
     time_base.den         = avio_rl32(s->pb);
     time_base.num         = avio_rl32(s->pb);
-    st->duration          = avio_rl64(s->pb);
+    st->duration          = avio_rl32(s->pb);
+    avio_skip(s->pb, 4); // unused
 
     st->need_parsing      = AVSTREAM_PARSE_HEADERS;