diff --git a/compiler/generic/vm-fndb.lisp b/compiler/generic/vm-fndb.lisp
index dfe5ec689f9db82ed05bc1cde12098bcf0bc5a13..17d9d7cd8012fc8ccab0b6dd5a38581872f1e954 100644
--- a/compiler/generic/vm-fndb.lisp
+++ b/compiler/generic/vm-fndb.lisp
@@ -7,7 +7,7 @@
 ;;; Scott Fahlman (FAHLMAN@CMUC). 
 ;;; **********************************************************************
 ;;;
-;;; $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.23 1990/08/21 14:58:38 wlott Exp $
+;;; $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/generic/vm-fndb.lisp,v 1.24 1990/10/02 05:40:29 wlott Exp $
 ;;;
 ;;; This file defines the machine specific function signatures.
 ;;;
@@ -88,6 +88,10 @@
   (unsafe))
 
 
+(defknown structurify (simple-vector) structure
+  (unsafe))
+
+
 (defknown %raw-bits (t fixnum) (unsigned-byte 32)
   (foldable flushable))
 (defknown (%set-raw-bits) (t fixnum (unsigned-byte 32)) (unsigned-byte 32)