diff --git a/varlink/server.py b/varlink/server.py
index c0fd176..03e7259 100644
--- a/varlink/server.py
+++ b/varlink/server.py
@@ -181,9 +181,7 @@ def _handle(self, message, raw_message, _server=None, _request=None):
 
             if self._namespaced:
                 # FIXME: check for Maybe before taking None as default value
-                out = func(
-                    *(getattr(parameters, k, default=None) for k in method.in_type.fields.keys()), **kwargs
-                )
+                out = func(*(getattr(parameters, k, None) for k in method.in_type.fields.keys()), **kwargs)
             else:
                 # FIXME: check for Maybe before taking None as default value
                 out = func(*(parameters.get(k) for k in method.in_type.fields.keys()), **kwargs)