--- tools/asdf.lisp
+++ tools/asdf.lisp
@@ -7186,7 +7186,7 @@ also \"Configuration DSL\"\) in the ASDF manual."
             (or (remove nil (getenv-absolute-directories "XDG_DATA_DIRS"))
                 (os-cond
                  ((os-windows-p) (mapcar 'get-folder-path '(:appdata :common-appdata)))
-                 (t (mapcar 'parse-unix-namestring '("/usr/local/share/" "/usr/share/")))))))
+                 (t (mapcar 'parse-unix-namestring '("@@PREFIX@@/share/" "/usr/local/share/" "/usr/share/")))))))
 
   (defun xdg-config-dirs (&rest more)
     "The preference-ordered set of additional base paths to search for configuration files.