diff --git a/libs/gst/base/gstbaseparse.c b/libs/gst/base/gstbaseparse.c
index a43d293436..f42389af18 100644
--- a/libs/gst/base/gstbaseparse.c
+++ b/libs/gst/base/gstbaseparse.c
@@ -3016,8 +3016,10 @@ gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
     /* already inform subclass what timestamps we have planned,
      * at least if provided by time-based upstream */
     if (parse->priv->upstream_format == GST_FORMAT_TIME) {
+      tmpbuf = gst_buffer_make_writable (tmpbuf);
       GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
       GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
+      GST_BUFFER_DURATION (tmpbuf) = GST_CLOCK_TIME_NONE;
     }
 
     /* keep the adapter mapped, so keep track of what has to be flushed */