diff --git a/include/boost/integer/static_log2.hpp b/include/boost/integer/static_log2.hpp
index 56c7a00..db3aba2 100644
--- a/include/boost/integer/static_log2.hpp
+++ b/include/boost/integer/static_log2.hpp
@@ -16,7 +16,8 @@
 #ifndef BOOST_INTEGER_STATIC_LOG2_HPP
 #define BOOST_INTEGER_STATIC_LOG2_HPP
 
-#include "boost/integer_fwd.hpp" // for boost::intmax_t
+#include <boost/config.hpp>
+#include <boost/integer_fwd.hpp>
 
 namespace boost {
 
@@ -122,6 +123,4 @@ namespace boost {
 
 }
 
-
-
 #endif // include guard
diff --git a/include/boost/integer/static_min_max.hpp b/include/boost/integer/static_min_max.hpp
index ee76fd4..e4e6a4a 100644
--- a/include/boost/integer/static_min_max.hpp
+++ b/include/boost/integer/static_min_max.hpp
@@ -10,6 +10,7 @@
 #ifndef BOOST_INTEGER_STATIC_MIN_MAX_HPP
 #define BOOST_INTEGER_STATIC_MIN_MAX_HPP
 
+#include <boost/config.hpp>
 #include <boost/integer_fwd.hpp>  // self include
 
 namespace boost