diff --git a/header.lisp b/header.lisp
index 72cb16280a4963c6b6cd21395cfabbdf90a09d40..3659f15ae10f924ff904fbc851db9c1782d65114 100644
--- a/header.lisp
+++ b/header.lisp
@@ -72,7 +72,7 @@
       (when (and existing-version
                  (< existing-version-number
                     #+(or allegro clisp lispworks sbcl) 2.0
-                    #+(or allegro clisp lispworks sbcl) 2.27))
+                    #-(or allegro clisp lispworks sbcl) 2.27))
         (rename-package :asdf away)
         (when *load-verbose*
           (format t "~&; Renamed old ~A package away to ~A~%" :asdf away))))))