diff --git a/gst/avi/gstavimux.c b/gst/avi/gstavimux.c
index ed78c1f1e1..6dc767ffbb 100644
--- a/gst/avi/gstavimux.c
+++ b/gst/avi/gstavimux.c
@@ -1830,6 +1830,9 @@ gst_avi_mux_stop_file (GstAviMux * avimux)
         audpad->auds.blockalign = audpad->max_audio_chunk;
       if (audpad->auds.blockalign == 0)
         audpad->auds.blockalign = 1;
+      /* note that hdr.rate is actually used by demux in cbr case */
+      if (avipad->hdr.scale <= 1)
+        avipad->hdr.rate = audpad->auds.av_bps / audpad->auds.blockalign;
       avimux->avi_hdr.max_bps += audpad->auds.av_bps;
       avipad->hdr.length = gst_util_uint64_scale (audpad->audio_time,
           avipad->hdr.rate, avipad->hdr.scale * GST_SECOND);