diff --git a/.dir-locals.el b/.dir-locals.el
index b934213..cd25df5 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -4,12 +4,7 @@
 ((nil
   . ((fill-column . 78)
      (tab-width   .  8)
-     (sentence-end-double-space . t)
-
-     ;; For use with 'bug-reference-prog-mode'.
-     (bug-reference-url-format . "https://gitlab.com/nonguix/nonguix/issues/%s")
-     (bug-reference-bug-regexp
-      . "\\(#\\([0-9]+\\)\\)")))
+     (sentence-end-double-space . t)))
  (c-mode          . ((c-file-style . "gnu")))
  (scheme-mode
   .