diff --git a/include/boost/config/compiler/vacpp.hpp b/include/boost/config/compiler/vacpp.hpp
index 371aae83..336fabe3 100644
--- a/include/boost/config/compiler/vacpp.hpp
+++ b/include/boost/config/compiler/vacpp.hpp
@@ -9,11 +9,16 @@
 
 #if __IBMCPP__ <= 501
 #  define BOOST_NO_MEMBER_TEMPLATE_FRIENDS
-#  define BOOST_NO_INCLASS_MEMBER_INITIALIZATION
 #  define BOOST_NO_MEMBER_FUNCTION_SPECIALIZATIONS
 #endif
 
-#if (__IBMCPP__ <= 502)|| !defined(BOOST_STRICT_CONFIG)
+#if (__IBMCPP__ <= 502) || !defined(BOOST_STRICT_CONFIG)
+// Actually the compiler supports inclass member initialization but it
+// requires a definition for the class member and it doesn't recognize
+// it as an integral constant expression when used as a template argument.
+#  define BOOST_NO_INCLASS_MEMBER_INITIALIZATION
+
+#  define BOOST_NO_MEMBER_TEMPLATE_KEYWORD
 #  define BOOST_NO_INTEGRAL_INT64_T
 #endif