diff --git a/include/boost/python/detail/void_ptr.hpp b/include/boost/python/detail/void_ptr.hpp
index 676a5cac..07c5d3a5 100644
--- a/include/boost/python/detail/void_ptr.hpp
+++ b/include/boost/python/detail/void_ptr.hpp
@@ -6,6 +6,8 @@
 #ifndef VOID_PTR_DWA200239_HPP
 # define VOID_PTR_DWA200239_HPP
 
+# include <boost/type_traits/remove_cv.hpp>
+
 namespace boost { namespace python { namespace detail { 
 
 template <class U>
diff --git a/include/boost/python/opaque_pointer_converter.hpp b/include/boost/python/opaque_pointer_converter.hpp
index 8ec4be3b..6f025c87 100644
--- a/include/boost/python/opaque_pointer_converter.hpp
+++ b/include/boost/python/opaque_pointer_converter.hpp
@@ -15,6 +15,7 @@
 # include <boost/python/detail/dealloc.hpp>
 # include <boost/python/detail/none.hpp>
 # include <boost/type_traits/remove_pointer.hpp>
+# include <boost/type_traits/is_pointer.hpp>
 
 // opaque_pointer_converter --
 //