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-rw-r--r--bits/byteswap.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/bits/byteswap.h b/bits/byteswap.h
index 7866abe9c2..38d8540130 100644
--- a/bits/byteswap.h
+++ b/bits/byteswap.h
@@ -1,5 +1,5 @@
 /* Macros to swap the order of bytes in integer values.
-   Copyright (C) 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -21,6 +21,9 @@
 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
 #endif
 
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
 /* Swap bytes in 16 bit value.  */
 #ifdef __GNUC__
 # define __bswap_16(x) \
@@ -77,3 +80,5 @@ __bswap_32 (unsigned int __bsx)
 	   }								      \
 	 __r.__ll; }))
 #endif
+
+#endif /* _BITS_BYTESWAP_H */