diff --git a/Lib/unittest/runner.py b/Lib/unittest/runner.py
index ea3c585..3ed9447 100644
--- a/Lib/unittest/runner.py
+++ b/Lib/unittest/runner.py
@@ -12,6 +12,8 @@
         self.stream = stream
 
     def __getattr__(self, attr):
+        if attr in ('stream', '__getstate__'):
+            raise AttributeError(attr)
         return getattr(self.stream,attr)
 
     def writeln(self, arg=None):