diff --git a/.dir-locals.el b/.dir-locals.el
index c70ee6a..6ae6742 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -7,6 +7,8 @@
  (emacs-lisp-mode
   (indent-tabs-mode . nil)
   (mode . bug-reference-prog))
+ (sh-mode
+  (sh-basic-offset . 4))
  (texinfo-mode
   (indent-tabs-mode . nil)
   (mode . bug-reference-prog)))