diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index e3387a7..d53a764 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -524,6 +524,7 @@
 	bt->bs = kzalloc(BT_WAIT_QUEUES * sizeof(*bt->bs), GFP_KERNEL);
 	if (!bt->bs) {
 		kfree(bt->map);
+		bt->map = NULL;
 		return -ENOMEM;
 	}