diff --git a/block/blk.h b/block/blk.h
index e38691d..aae4d88 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -1,6 +1,8 @@
 #ifndef BLK_INTERNAL_H
 #define BLK_INTERNAL_H
 
+#include <linux/idr.h>
+
 /* Amount of time in which a process may batch requests */
 #define BLK_BATCH_TIME	(HZ/50UL)
 
@@ -9,6 +11,7 @@
 
 extern struct kmem_cache *blk_requestq_cachep;
 extern struct kobj_type blk_queue_ktype;
+extern struct ida blk_queue_ida;
 
 void init_request_from_bio(struct request *req, struct bio *bio);
 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,