diff --git a/src/undo.c b/src/undo.c
index bb5c73d..c9a80dc 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1,4 +1,4 @@
-/* vi:set ts=8 sts=4 sw=4:
+/* vi:set ts=8 sts=4 sw=4 noet:
  *
  * VIM - Vi IMproved	by Bram Moolenaar
  *