diff --git a/Lib/bdb.py b/Lib/bdb.py
index 3ca25ad..f2cf4ca 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -46,7 +46,7 @@
 		return self.trace_dispatch
 	
 	def dispatch_call(self, frame, arg):
-		frame.f_locals['__args__'] = arg
+		# XXX 'arg' is no longer used
 		if self.botframe is None:
 			# First call of dispatch since reset()
 			self.botframe = frame