diff --git a/sys/vm/vm.h b/sys/vm/vm.h
index 491872bf69ae..1629146403be 100644
--- a/sys/vm/vm.h
+++ b/sys/vm/vm.h
@@ -114,6 +114,9 @@ struct vm_page;
 typedef struct vm_page *vm_page_t;
 #endif				/* _KERNEL */
 
+struct vm_reserv;
+typedef struct vm_reserv *vm_reserv_t;
+
 /*
  * Information passed from the machine-independant VM initialization code
  * for use by machine-dependant code (mainly for MMU support)