diff --git a/Lib/shutil.py b/Lib/shutil.py
index 10b7a27..fde8c90 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -128,6 +128,7 @@
     cmdtuples = []
     arg = path
     try:
+        func = os.listdir # Make sure it isn't unset
         _build_cmdtuple(path, cmdtuples)
         for func, arg in cmdtuples:
             func(arg)