diff --git a/ext/smoothstreaming/gstdownloadrate.c b/ext/smoothstreaming/gstdownloadrate.c
index 57e26f29da..93ad24c4a9 100644
--- a/ext/smoothstreaming/gstdownloadrate.c
+++ b/ext/smoothstreaming/gstdownloadrate.c
@@ -50,6 +50,7 @@ void
 gst_download_rate_deinit (GstDownloadRate * rate)
 {
   gst_download_rate_clear (rate);
+  g_static_mutex_free (&rate->mutex);
 }
 
 void