diff --git a/Lib/SimpleXMLRPCServer.py b/Lib/SimpleXMLRPCServer.py
index b304e45..6af2f2f 100644
--- a/Lib/SimpleXMLRPCServer.py
+++ b/Lib/SimpleXMLRPCServer.py
@@ -164,7 +164,7 @@
     reason to instantiate this class directly.
     """
 
-    def __init__(self, allow_none, encoding):
+    def __init__(self, allow_none=False, encoding=None):
         self.funcs = {}
         self.instance = None
         self.allow_none = allow_none