diff --git a/sys/vm/vm_kern.h b/sys/vm/vm_kern.h
index 2f283e3ff9c6..3b86892b43ac 100644
--- a/sys/vm/vm_kern.h
+++ b/sys/vm/vm_kern.h
@@ -67,7 +67,6 @@
 extern vm_map_t buffer_map;
 extern vm_map_t kernel_map;
 extern vm_map_t kmem_map;
-extern vm_map_t clean_map;
 extern vm_map_t exec_map;
 extern vm_map_t pipe_map;
 extern u_int vm_kmem_size;