diff --git a/block/blk-core.c b/block/blk-core.c
index ee33590f54eb..4a36377df394 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1180,6 +1180,7 @@ out_exit_flush_rq:
 		q->exit_rq_fn(q, q->fq->flush_rq);
 out_free_flush_queue:
 	blk_free_flush_queue(q->fq);
+	q->fq = NULL;
 	return -ENOMEM;
 }
 EXPORT_SYMBOL(blk_init_allocated_queue);