diff --git a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
index 083524b9..429fc170 100644
--- a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
+++ b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
@@ -22,33 +22,26 @@ namespace triqs { namespace py_tools {
 
 %for n,t in enumerate(module.wrapped_types_by_me) :
 
-template<> struct py_converter<${t}> {
- static void ** init();
- static PyObject * c2py(${t} const & x);
- static ${t}& py2c(PyObject * ob);
- static bool is_convertible(PyObject *ob, bool raise_exception);
-};
-
- void ** py_converter<${t}>::init() {
+ template<> void ** py_converter<${t}>::init() {
    PyObject * mod =  PyImport_ImportModule("${module.full_name}");
    if (mod ==NULL) return NULL;
    void ** table = (void **)PyCapsule_Import("${module.full_name}._exported_wrapper_convert_fnt", 0);
    return table;
  }
  
- PyObject * py_converter<${t}>::c2py(${t} const & x){
+ template<> PyObject * py_converter<${t}>::c2py(${t} const & x){
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) return NULL;
    return ((PyObject * (*)(${t} const &)) wrapped_convert_fnt[3*${n}])(x);
  }
  
- ${t}& py_converter<${t}>::py2c(PyObject * ob){
+ template<> ${t}& py_converter<${t}>::py2c(PyObject * ob){
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) std::terminate(); // It should never happen since py2c is called only is is_convertible is true (py_converter specs) 
    return ((${t}& (*)(PyObject *)) wrapped_convert_fnt[3*${n}+1])(ob);
  }
  
- bool py_converter<${t}>::is_convertible(PyObject *ob, bool raise_exception) {
+ template<> bool py_converter<${t}>::is_convertible(PyObject *ob, bool raise_exception) {
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) {
     if (!raise_exception && PyErr_Occurred()) {PyErr_Print();PyErr_Clear();}