diff -r ba8f85e16dd9 Lib/subprocess.py
--- a/Lib/subprocess.py	Sat Mar 10 00:21:44 2012 +0100
+++ b/Lib/subprocess.py	Fri Mar 09 16:19:58 2012 -0800
@@ -1246,7 +1246,7 @@
                 args = list(args)
 
             if shell:
-                args = ["/bin/sh", "-c"] + args
+                args = [os.environ.get("SHELL", "/bin/sh"), "-c"] + args
                 if executable:
                     args[0] = executable