diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 1ae7426..362d59a 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -553,8 +553,8 @@
 
 
     def _translate_newlines(self, data):
-        data = data.replace("\r\n", "\n")
-        data = data.replace("\r", "\n")
+        data = data.replace(b"\r\n", b"\n")
+        data = data.replace(b"\r", b"\n")
         return str(data)