diff --git a/lisp/files.el b/lisp/files.el
index 68e883513cb..68894ca2ce0 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -2723,6 +2723,7 @@ since only a single case-insensitive search through the alist is made."
      ("\\.scm\\.[0-9]*\\'" . scheme-mode)
      ("\\.[ckz]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)
      ("\\.bash\\'" . sh-mode)
+     ("/PKGBUILD\\'" . sh-mode)
      ("\\(/\\|\\`\\)\\.\\(bash_\\(profile\\|history\\|log\\(in\\|out\\)\\)\\|z?log\\(in\\|out\\)\\)\\'" . sh-mode)
      ("\\(/\\|\\`\\)\\.\\(shrc\\|zshrc\\|m?kshrc\\|bashrc\\|t?cshrc\\|esrc\\)\\'" . sh-mode)
      ("\\(/\\|\\`\\)\\.\\([kz]shenv\\|xinitrc\\|startxrc\\|xsession\\)\\'" . sh-mode)