diff --git a/six.py b/six.py
index 0bf7eb71d..fa2d7f1b0 100644
--- a/six.py
+++ b/six.py
@@ -69,7 +69,6 @@ def __len__(self):
         else:
             # 64-bit
             MAXSIZE = int((1 << 63) - 1)
-        del X
 
 
 def _add_doc(func, doc):