diff --git a/Lib/io.py b/Lib/io.py
index af5a144f27a..96b3e5d4d4b 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -1373,7 +1373,7 @@ class TextIOWrapper(TextIOBase):
     write contains a newline character.
     """
 
-    _CHUNK_SIZE = 128
+    _CHUNK_SIZE = 2048
 
     def __init__(self, buffer, encoding=None, errors=None, newline=None,
                  line_buffering=False):