diff --git a/include/boost/type_traits/common_type.hpp b/include/boost/type_traits/common_type.hpp
index 954c723..cf733f3 100644
--- a/include/boost/type_traits/common_type.hpp
+++ b/include/boost/type_traits/common_type.hpp
@@ -9,6 +9,7 @@
 //  http://www.boost.org/LICENSE_1_0.txt
 //
 
+#include <boost/config.hpp>
 #include <boost/type_traits/decay.hpp>
 #include <boost/utility/declval.hpp>