diff --git a/sys/sys/bio.h b/sys/sys/bio.h
--- a/sys/sys/bio.h
+++ b/sys/sys/bio.h
@@ -75,7 +75,6 @@
 #ifdef _KERNEL
 struct disk;
 struct bio;
-struct vm_map;
 
 typedef void bio_task_t(void *);
 
@@ -144,7 +143,6 @@
 	int batched;
 };
 
-extern struct vm_map *bio_transient_map;
 extern int bio_transient_maxcnt;
 
 void biodone(struct bio *bp);