diff --git a/configure.ac b/configure.ac
index de9d56c13..58d8e8e81 100644
--- a/configure.ac
+++ b/configure.ac
@@ -419,6 +419,7 @@ _MY_CXX_CHECK_CXX_VER()
 AC_MSG_RESULT($_my_result)
 if test "$_my_result" = "no" ; then
    CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_STD_NEWEST"
+   CFG_CXX_FLAGS_CMAKE="$CFG_CXX_FLAGS_CMAKE $CFG_CXXFLAGS_STD_NEWEST"
    AC_MSG_CHECKING(whether $CXX supports C++11 with $CFG_CXXFLAGS_STD_NEWEST)
    _MY_CXX_CHECK_CXX_VER()
    AC_MSG_RESULT($_my_result)