diff --git a/stdlib-samples/3.2/subprocess.py b/stdlib-samples/3.2/subprocess.py
index e286525da8b3..9bcdfb72f019 100644
--- a/stdlib-samples/3.2/subprocess.py
+++ b/stdlib-samples/3.2/subprocess.py
@@ -738,7 +738,7 @@ def __init__(self, args: Sequence[Any], bufsize: int = 0,
         if p2cwrite != -1:
             self.stdin = io.open(p2cwrite, 'wb', bufsize)
             if self.universal_newlines:
-                self.stdin = io.TextIOWrapper(self.stdin, write_through=True)
+                self.stdin = io.TextIOWrapper(self.stdin)
         if c2pread != -1:
             self.stdout = io.open(c2pread, 'rb', bufsize)
             if universal_newlines: