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-rw-r--r--include/ruby/backward/2/bool.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/ruby/backward/2/bool.h b/include/ruby/backward/2/bool.h
index 8c619b8215..b2cca2a206 100644
--- a/include/ruby/backward/2/bool.h
+++ b/include/ruby/backward/2/bool.h
@@ -1,4 +1,6 @@
-/** \noop-*-C++-*-vi:ft=cpp
+#ifndef RUBY_BACKWARD2_BOOL_H /*-*-C++-*-vi:se ft=cpp:*/
+#define RUBY_BACKWARD2_BOOL_H
+/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
@@ -31,3 +33,5 @@
#elif ! TRUE
# error TRUE must be true
#endif
+
+#endif /* RUBY_BACKWARD2_BOOL_H */