diff --git a/ha-config.org b/ha-config.org
index 755397e..9e25afe 100644
--- a/ha-config.org
+++ b/ha-config.org
@@ -227,7 +227,8 @@ When I push changes to my files to Gerrit and other code review, I don’t want
     "Cleanup a file, often done before a file save."
     (interactive)
     (ignore-errors
-      (untabify (point-min) (point-max))
+      (unless (equal major-mode 'makefile-bsdmake-mode)
+        (untabify (point-min) (point-max)))
       (delete-trailing-whitespace)))
 
   (add-hook 'before-save-hook #'ha-cleanup-buffer-file)