diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index be6cf11af8d..ea4fa7a2d1c 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -1189,7 +1189,7 @@ class _ListDataStream(io.BufferedIOBase):
     """
     def __init__(self, lst):
         self.lst = lst
-        
+
     def writable(self):
         return True