diff --git a/.dir-locals.el b/.dir-locals.el
index aaa7362aec10562c338e7aee19f8fe85bf5f6e50..21e495a4626bc6641f199852bf8efcd9602493d4 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -2,4 +2,5 @@
       ((c-file-style . "gnu")
        (indent-tabs-mode . nil)
        (fill-column . 79)))
+ (c-mode . (c-basic-offset 2))
  (makefile-mode . ((indent-tabs-mode . t))))