diff --git a/include/boost/tuple/tuple_io.hpp b/include/boost/tuple/tuple_io.hpp
index 322ce6f..d6ea8da 100644
--- a/include/boost/tuple/tuple_io.hpp
+++ b/include/boost/tuple/tuple_io.hpp
@@ -439,7 +439,7 @@ extract_and_check_delimiter(
 #if defined (BOOST_NO_STD_LOCALE)
   const bool is_delimiter = !isspace(d);
 #elif defined ( __BORLANDC__ )
-  const bool !is_delimiter = std::use_facet< std::ctype< CharType > >
+  const bool is_delimiter = !std::use_facet< std::ctype< CharType > >
     (is.getloc() ).is( std::ctype_base::space, d);
 #else
   const bool is_delimiter = (!std::isspace(d, is.getloc()) );