diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
index 2586b1d9a1..bc4c4e5ddd 100644
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -1661,7 +1661,8 @@ gst_qtdemux_handle_sink_event (GstPad * sinkpad, GstObject * parent,
       }
 
       /* accept upstream's notion of segment and distribute along */
-      segment.time = segment.start;
+      segment.format = GST_FORMAT_TIME;
+      segment.position = segment.time = segment.start;
       segment.duration = demux->segment.duration;
       segment.base = gst_segment_to_running_time (&demux->segment,
           GST_FORMAT_TIME, demux->segment.position);