--- instance_holder.hpp	2015-09-02 08:07:49.000000000 -0400
+++ instance_holder-new.hpp	2016-01-16 12:35:58.000000000 -0500
@@ -32,6 +32,7 @@
     virtual void* holds(type_info, bool null_ptr_only) = 0;
 
     void install(PyObject* inst) throw();
+    void uninstall(PyObject* inst) throw();
 
     // These functions should probably be located elsewhere.