1 files changed, 1 insertions, 1 deletions
diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index 2366b1a..798650d 100755
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -415,7 +415,7 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
         }
         PyTuple_SET_ITEM(fnames, i, field);
     }
-    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
+    result = PyObject_CallFunction((PyObject*)&PyType_Type, "U(O){sOss}",
                     type, base, "_fields", fnames, "__module__", "_ast");
     Py_DECREF(fnames);
     return (PyTypeObject*)result;