diff --git a/lisp/ti-config/work-config.el b/lisp/ti-config/work-config.el
index 9d07701..b0d06a9 100644
--- a/lisp/ti-config/work-config.el
+++ b/lisp/ti-config/work-config.el
@@ -46,6 +46,7 @@
 (add-to-list 'auto-mode-alist '("\\.cdis$" . asm-mode))
 (add-to-list 'auto-mode-alist '("\\.cmd$" . conf-mode))
 (add-to-list 'auto-mode-alist '("\\.fsdump$" . argo-fastsim-dump-mode))
+(add-to-list 'auto-mode-alist `("/Makefile\\.[^/]*\\'" . makefile-mode))
 
 (use-package ein
   :config