--- class.cpp	2015-09-02 08:07:49.000000000 -0400
+++ class-new.cpp	2016-01-16 12:30:22.000000000 -0500
@@ -308,6 +308,23 @@
     ((objects::instance<>*)self)->objects = this;
 }
 
+// Uninstall the instance data for a C++ object into a Python instance
+// object.
+void instance_holder::uninstall(PyObject* self) throw()
+{
+	assert(self->ob_type->ob_type == &class_metatype_object);
+	instance_holder **chain = &(((objects::instance<>*)self)->objects);
+
+	// iterate through, looking for the pointer that points to this
+	while ( *chain && *chain != this )
+			chain = &((*chain)->m_next);
+
+	// set that pointer to point to the m_next
+	if (*chain)
+			*chain = m_next;
+
+	m_next = 0;
+}
 
 namespace objects
 {