diff --git a/ChangeLog b/ChangeLog
index 6f53d8c6b5..319f84a28b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-05-13  Wim Taymans  <wim.taymans@collabora.co.uk>
+
+	* ext/speex/gstspeexdec.c: (speex_dec_sink_event):
+	Fix the calculation of the duration of the concealment packets.
+
 2008-05-12  Wim Taymans  <wim.taymans@collabora.co.uk>
 
 	Based on patch by: Olivier Crete <tester at tester dot ca>
diff --git a/ext/speex/gstspeexdec.c b/ext/speex/gstspeexdec.c
index c0cba93060..a42de61858 100644
--- a/ext/speex/gstspeexdec.c
+++ b/ext/speex/gstspeexdec.c
@@ -466,7 +466,7 @@ speex_dec_sink_event (GstPad * pad, GstEvent * event)
         if (dec->segment.last_stop < start) {
           GstClockTime duration;
 
-          duration = dec->segment.last_stop - start;
+          duration = start - dec->segment.last_stop;
           speex_dec_chain_parse_data (dec, NULL, dec->segment.last_stop,
               duration);
         }