diff --git a/.dir-locals.el b/.dir-locals.el
index fc70462d40..21392ecf28 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -1,7 +1,8 @@
 ;;; Directory Local Variables
 ;;; For more information see (info "(emacs) Directory Variables")
 ;;; Match project coding conventions
+
 ((c-mode
   (indent-tabs-mode . t)
+  (show-trailing-whitespace . t)
   (c-basic-offset . 8)))
-