diff --git a/include/boost/config/compiler/comeau.hpp b/include/boost/config/compiler/comeau.hpp
index 9f6ed76b..78215f73 100644
--- a/include/boost/config/compiler/comeau.hpp
+++ b/include/boost/config/compiler/comeau.hpp
@@ -21,7 +21,6 @@
 #  endif
 
 #  if defined(_MSC_VER) && _MSC_VER <= 1300
-#     define BOOST_NO_STDC_NAMESPACE
 #     if _MSC_VER > 100
          // only set this in non-strict mode:
 #        define BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP