diff --git a/block.c b/block.c
index fe5050c53f..9c810534d6 100644
--- a/block.c
+++ b/block.c
@@ -6442,6 +6442,7 @@ void bdrv_refresh_filename(BlockDriverState *bs)
                 child->bs->exact_filename);
         pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename);
 
+        qobject_unref(bs->full_open_options);
         bs->full_open_options = qobject_ref(child->bs->full_open_options);
 
         return;