diff --git a/include/boost/type_traits/detail/has_binary_operator.hpp b/include/boost/type_traits/detail/has_binary_operator.hpp
index 9257bc2..1fd26ef 100644
--- a/include/boost/type_traits/detail/has_binary_operator.hpp
+++ b/include/boost/type_traits/detail/has_binary_operator.hpp
@@ -31,7 +31,7 @@
 // msvc:
 //    warning C4018: '<' : signed/unsigned mismatch
 //    warning C4244: '+=' : conversion from 'double' to 'char', possible loss of data
-//    warning C4547: '*' : operator before comma has no effect; expected operator with side-effect
+//    warning C4547: '*' : operator before comma has no effect; expected operator with side-effect
 //    warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning)
 //    warning C4804: '<' : unsafe use of type 'bool' in operation
 //    warning C4805: '==' : unsafe mix of type 'bool' and type 'char' in operation