diff --git a/src/one-body-sample.cc b/src/one-body-sample.cc
index fd1f4bf0872def4baeef0f97358a7a3c25103f11..ffe0ff3cc8fdf32ec693362e0882c7d72cc0cc79 100644
--- a/src/one-body-sample.cc
+++ b/src/one-body-sample.cc
@@ -1,4 +1,4 @@
-/* -*- mode:c++; mode:semantic -*- */
+/* -*- mode:c++; mode:semantic; mode:subword -*- */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"