diff --git a/include/boost/python/detail/module_base.hpp b/include/boost/python/detail/module_base.hpp
new file mode 100644
index 00000000..e8a00ba6
--- /dev/null
+++ b/include/boost/python/detail/module_base.hpp
@@ -0,0 +1,44 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#ifndef MODULE_BASE_DWA2002227_HPP
+# define MODULE_BASE_DWA2002227_HPP
+# include <boost/python/detail/wrap_python.hpp>
+# include <boost/python/reference.hpp>
+
+namespace boost { namespace python { namespace detail { 
+
+class BOOST_PYTHON_DECL module_base
+{
+ public:
+    // Create a module. REQUIRES: only one module is created per module.
+    module_base(const char* name);
+    ~module_base();
+
+    // Add elements to the module
+    void setattr(const char* name, PyObject*);
+    void setattr(const char* name, ref const&);
+    void add(PyTypeObject* x); // just use the type's name
+    void add_type(ref);
+    
+    // Return a reference to the Python module object being built
+    inline ref object() const;
+
+ private:
+    ref m_module;
+    static PyMethodDef initial_methods[1];
+};
+
+//
+// inline implementations
+//
+inline ref module_base::object() const
+{
+    return m_module;
+}
+
+}}} // namespace boost::python::detail
+
+#endif // MODULE_BASE_DWA2002227_HPP
diff --git a/include/boost/python/module.hpp b/include/boost/python/module.hpp
index 11b0b6c7..7df183d5 100644
--- a/include/boost/python/module.hpp
+++ b/include/boost/python/module.hpp
@@ -8,36 +8,14 @@
 
 # include <boost/python/errors.hpp>
 # include <boost/python/detail/config.hpp>
-# include <boost/python/reference.hpp>
 # include <boost/python/make_function.hpp>
 # include <boost/python/objects.hpp>
-# include <boost/python/detail/wrap_python.hpp>
 # include <boost/python/class_fwd.hpp>
+# include <boost/python/detail/module_base.hpp>
 
 namespace boost { namespace python {
 
-class BOOST_PYTHON_DECL module_base
-{
- public:
-    // Create a module. REQUIRES: only one module is created per module.
-    module_base(const char* name);
-    ~module_base();
-
-    // Add elements to the module
-    void setattr(const char* name, PyObject*);
-    void setattr(const char* name, ref const&);
-    void add(PyTypeObject* x); // just use the type's name
-    void add_type(ref);
-    
-    // Return a reference to the Python module object being built
-    ref object() const;
-
- private:
-    ref m_module;
-    static PyMethodDef initial_methods[1];
-};
-
-class module : public module_base
+class module : public detail::module_base
 {
  public:
     module(const char* name)
@@ -76,11 +54,6 @@ class module : public module_base
 //
 // inline implementations
 //
-inline ref module_base::object() const
-{
-    return m_module;
-}
-
 inline module& module::setattr(const char* name, PyObject* x)
 {
     this->module_base::setattr(name, x);
diff --git a/include/boost/python/object/class.hpp b/include/boost/python/object/class.hpp
index 04f0e992..0d5210c7 100644
--- a/include/boost/python/object/class.hpp
+++ b/include/boost/python/object/class.hpp
@@ -6,7 +6,6 @@
 #ifndef CLASS_DWA20011214_HPP
 # define CLASS_DWA20011214_HPP
 
-# include <boost/python/module.hpp>
 # include <boost/python/detail/wrap_python.hpp>
 # include <boost/python/detail/config.hpp>
 # include <boost/utility.hpp>
diff --git a/src/module.cpp b/src/module.cpp
index dbc81729..0291c9c1 100644
--- a/src/module.cpp
+++ b/src/module.cpp
@@ -6,9 +6,10 @@
 //  The author gratefully acknowleges the support of Dragon Systems, Inc., in
 //  producing this work.
 
-#include <boost/python/module.hpp>
+#include <boost/python/detail/module_base.hpp>
+#include <boost/python/object/function.hpp>
 
-namespace boost { namespace python {
+namespace boost { namespace python { namespace detail {
 
 module_base::module_base(const char* name)
     : m_module(
@@ -46,4 +47,4 @@ void module_base::add_type(ref x)
 
 PyMethodDef module_base::initial_methods[] = { { 0, 0, 0, 0 } };
 
-}} // namespace boost::python
+}}} // namespace boost::python::detail
diff --git a/src/object/class.cpp b/src/object/class.cpp
index 8186f9be..b9deb98f 100644
--- a/src/object/class.cpp
+++ b/src/object/class.cpp
@@ -3,8 +3,7 @@
 // copyright notice appears in all copies. This software is provided
 // "as is" without express or implied warranty, and with no claim as
 // to its suitability for any purpose.
-#include <boost/python/detail/config.hpp>
-#include <boost/python/detail/wrap_python.hpp>
+#include <boost/python/converter/registry.hpp>
 #include <boost/python/object/class.hpp>
 #include <boost/python/objects.hpp>
 #include <boost/python/detail/map_entry.hpp>