gst_tag_list_free -> gst_tag_list_unref
diff --git a/gst/isomp4/gstqtmux.c b/gst/isomp4/gstqtmux.c
index 992d8c1..221dd06 100644
--- a/gst/isomp4/gstqtmux.c
+++ b/gst/isomp4/gstqtmux.c
@@ -1174,7 +1174,7 @@
     GST_DEBUG_OBJECT (qtmux, "Formatting tags");
     gst_qt_mux_add_metadata_tags (qtmux, copy);
     gst_qt_mux_add_xmp_tags (qtmux, copy);
-    gst_tag_list_free (copy);
+    gst_tag_list_unref (copy);
   } else {
     GST_DEBUG_OBJECT (qtmux, "No tags received");
   }