diff --git a/drivers/md/bcache/request.h b/drivers/md/bcache/request.h
index aa055cfeb099..721bf336ed1a 100644
--- a/drivers/md/bcache/request.h
+++ b/drivers/md/bcache/request.h
@@ -39,6 +39,6 @@ void bch_data_insert(struct closure *cl);
 void bch_cached_dev_request_init(struct cached_dev *dc);
 void bch_flash_dev_request_init(struct bcache_device *d);
 
-extern struct kmem_cache *bch_search_cache, *bch_passthrough_cache;
+extern struct kmem_cache *bch_search_cache;
 
 #endif /* _BCACHE_REQUEST_H_ */