diff --git a/Lib/SocketServer.py b/Lib/SocketServer.py
index 9a646ab6eb7..6c371e2d998 100644
--- a/Lib/SocketServer.py
+++ b/Lib/SocketServer.py
@@ -392,7 +392,7 @@ class StreamRequestHandler(BaseRequestHandler):
 
     def setup(self):
 	self.connection = self.request
-	self.rfile = self.connection.makefile('rb')
+	self.rfile = self.connection.makefile('rb', 0)
 	self.wfile = self.connection.makefile('wb', 0)
 
     def finish(self):