diff --git a/patacrep/content/__init__.py b/patacrep/content/__init__.py
index 6b7c70fa..1604204b 100755
--- a/patacrep/content/__init__.py
+++ b/patacrep/content/__init__.py
@@ -228,8 +228,7 @@ def validate_parser_argument(raw_schema):
 
     Will raise `ContentError` if the schema is not respected.
     """
-    rx_checker = Rx.Factory({"register_core_types": True})
-    schema = rx_checker.make_schema(yaml.load(raw_schema))
+    schema = Rx.make_schema(yaml.load(raw_schema))
 
     def wrap(parse):
         """Wrap the parse function"""