diff --git a/Lib/encodings/punycode.py b/Lib/encodings/punycode.py
index 2cde8b9..d97200f 100644
--- a/Lib/encodings/punycode.py
+++ b/Lib/encodings/punycode.py
@@ -214,9 +214,9 @@
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        if errors not in ('strict', 'replace', 'ignore'):
-            raise UnicodeError, "Unsupported error handling "+errors
-        return punycode_decode(input, errors)
+        if self.errors not in ('strict', 'replace', 'ignore'):
+            raise UnicodeError, "Unsupported error handling "+self.errors
+        return punycode_decode(input, self.errors)
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass