diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 431863ef879..ea4f4cedd01 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -171,6 +171,9 @@ def write(self, data):
 	    raise test_support.TestFailed, \
 		    'Writing: '+`data`+', expected: '+`expected`
 
+    def flush(self):
+	pass
+
     def close(self):
 	leftover = self.fp.read()
 	if leftover: