diff --git a/libavformat/mov.c b/libavformat/mov.c
index 424b8adf30..abeeaaed1f 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3396,7 +3396,7 @@ static int mov_read_header(AVFormatContext *s)
         for (i = 0; i < s->nb_streams; i++) {
             AVStream *st = s->streams[i];
             MOVStreamContext *sc = st->priv_data;
-            if (st->duration)
+            if (st->duration > 0)
                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;
         }
     }