diff --git a/block/blkio.c b/block/blkio.c
index 72b46d61fd..8e7ce42c79 100644
--- a/block/blkio.c
+++ b/block/blkio.c
@@ -690,7 +690,7 @@ static int blkio_virtio_blk_connect(BlockDriverState *bs, QDict *options,
         return -EINVAL;
     }
 
-    if (blkio_get_int(s->blkio, "fd", &fd) == 0) {
+    if (blkio_set_int(s->blkio, "fd", -1) == 0) {
         fd_supported = true;
     }