Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(revision 83179)
+++ Lib/subprocess.py	(working copy)
@@ -408,6 +408,7 @@
         self.returncode = returncode
         self.cmd = cmd
         self.output = output
+        super(CalledProcessError, self).__init__(returncode, cmd, output)
     def __str__(self):
         return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)