diff --git a/include/boost/python/operators.hpp b/include/boost/python/operators.hpp
index 41b1bf5c..f7017355 100644
--- a/include/boost/python/operators.hpp
+++ b/include/boost/python/operators.hpp
@@ -1,3 +1,14 @@
+//  (C) Copyright Ullrich Koethe and David Abrahams 2000-2001. Permission to
+//  copy, use, modify, sell and distribute this software is granted provided
+//  this copyright notice appears in all copies. This software is provided "as
+//  is" without express or implied warranty, and with no claim as to its
+//  suitability for any purpose.
+//
+//  The authors gratefully acknowlege the support of Dragon Systems, Inc., in
+//  producing this work.
+//
+//  Revision History:
+//  20 Jan 2001 - Added a fix from Ralf W. Grosse-Kunstleve (David Abrahams)
 #ifndef OPERATORS_UK112000_H_
 #define OPERATORS_UK112000_H_
 
@@ -9,9 +20,9 @@
 // strstream instead. Also, GCC 2.95.2 doesn't have sstream.
 # if defined(__SGI_STL_PORT) ? defined(__SGI_STL_OWN_IOSTREAMS) : (!defined(__GNUC__) || __GNUC__ > 2)
 #  define BOOST_PYTHON_USE_SSTREAM
-# endif
+# endi
 
-#if BOOST_PYTHON_USE_SSTREAM
+#if defined(BOOST_PYTHON_USE_SSTREAM)
 #  include <sstream>
 # else
 #  include <strstream>