diff --git a/config.org b/config.org
index 51d74de..19b13e4 100644
--- a/config.org
+++ b/config.org
@@ -303,7 +303,7 @@ If you're reading the raw org file instead of the published version, the code fo
                    (match-end 0))))
                ((eq 'require (plist-get confpkg :via))
                 (insert (format "(require '%s)\n" (plist-get confpkg :package))))
-               (t (insert (format "(warn \"%s confpkg :via has unrecognised value: %S\" %S %S)"
+               (t (insert (format "(warn \"%%s confpkg :via has unrecognised value: %%S\" %S %S)"
                                   (plist-get confpkg :name) (plist-get confpkg :via)))))
               (goto-char (point-min))
               (insert "\n;;:------------------------"