diff --git a/asdf.lisp b/asdf.lisp
index 988b44a5d0740218e83cc0a805f5b229fd908065..ea149edb0e1fcccd8bbabbf1904fd26a06aea6b9 100644
--- a/asdf.lisp
+++ b/asdf.lisp
@@ -208,7 +208,7 @@
   ;; This parameter isn't actually user-visible
   ;; -- please use the exported function ASDF:ASDF-VERSION below.
   ;; the 1+ hair is to ensure that we don't do an inadvertent find and replace
-  (subseq "VERSION:1.622" (1+ (length "VERSION"))))
+  (subseq "VERSION:1.623" (1+ (length "VERSION"))))
 
 (defun asdf-version ()
   "Exported interface to the version of ASDF currently installed. A string.