diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
index 811523c784..c666eb8e91 100644
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -2377,6 +2377,8 @@ qtdemux_parse_ftyp (GstQTDemux * qtdemux, const guint8 * buffer, gint length)
     qtdemux->major_brand = QT_FOURCC (buffer + 8);
     GST_DEBUG_OBJECT (qtdemux, "major brand: %" GST_FOURCC_FORMAT,
         GST_FOURCC_ARGS (qtdemux->major_brand));
+    if (qtdemux->comp_brands)
+      gst_buffer_unref (qtdemux->comp_brands);
     buf = qtdemux->comp_brands = gst_buffer_new_and_alloc (length - 16);
     gst_buffer_fill (buf, 0, buffer + 16, length - 16);
   }