diff --git a/sys/kern/vfs_hash.c b/sys/kern/vfs_hash.c
index c5d67c8b2b33..2e446e69a314 100644
--- a/sys/kern/vfs_hash.c
+++ b/sys/kern/vfs_hash.c
@@ -196,6 +196,7 @@ vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td,
 void
 vfs_hash_rehash(struct vnode *vp, u_int hash)
 {
+	ASSERT_VOP_ELOCKED(vp, "rehash requires excl lock");
 
 	rw_wlock(&vfs_hash_lock);
 	LIST_REMOVE(vp, v_hashlist);