diff --git a/wxPython/include/wx/wxPython/wxPython_int.h b/wxPython/include/wx/wxPython/wxPython_int.h
index ffba341273..9fb470f268 100644
--- a/wxPython/include/wx/wxPython/wxPython_int.h
+++ b/wxPython/include/wx/wxPython/wxPython_int.h
@@ -317,6 +317,7 @@ class wxPyCallbackHelper;
 struct swig_type_info;
 struct swig_const_info;
 
+typedef double (*py_objasdbl_conv)(PyObject *obj);
 
 // Make SunCC happy and make typedef's for these that are extern "C"
 typedef swig_type_info* (*p_SWIG_Python_TypeRegister_t)(swig_type_info *);