diff --git a/include/boost/lexical_cast.hpp b/include/boost/lexical_cast.hpp
index 686b9f5..3ac3cc9 100644
--- a/include/boost/lexical_cast.hpp
+++ b/include/boost/lexical_cast.hpp
@@ -261,7 +261,7 @@ namespace boost
 #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
             BOOST_STATIC_CONSTANT(std::size_t, value =
                   std::numeric_limits<Source>::is_signed +
-                  std::numeric_limits<Source>::is_specialized + // == 1
+                  std::numeric_limits<Source>::is_specialized + /* == 1 */
                   std::numeric_limits<Source>::digits10 * 2
               );
 #else