diff -r d356250e275d mock.py
--- a/mock.py	Tue Apr 09 14:53:33 2013 +0100
+++ b/mock.py	Wed Feb 26 15:12:18 2014 -0500
@@ -239,12 +239,21 @@
     funcopy.__name__ = func.__name__
     funcopy.__doc__ = func.__doc__
     #funcopy.__dict__.update(func.__dict__)
-    funcopy.__module__ = func.__module__
+    try:
+        funcopy.__module__ = func.__module__
+    except AttributeError:
+        pass
     if not inPy3k:
         funcopy.func_defaults = func.func_defaults
         return
-    funcopy.__defaults__ = func.__defaults__
-    funcopy.__kwdefaults__ = func.__kwdefaults__
+    try:
+        funcopy.__defaults__ = func.__defaults__
+    except AttributeError:
+        pass
+    try:
+        funcopy.__kwdefaults__ = func.__kwdefaults__
+    except AttributeError:
+        pass
 
 
 def _callable(obj):