diff --git a/pandas/io/common.py b/pandas/io/common.py
index 65cfdff1df14b..75f7a542525f5 100644
--- a/pandas/io/common.py
+++ b/pandas/io/common.py
@@ -94,7 +94,7 @@ def maybe_read_encoded_stream(reader, encoding=None):
         else:
             errors = 'replace'
             encoding = 'utf-8'
-        reader = StringIO(reader.read().decode(encoding, errors))
+        reader = BytesIO(reader.read())
     else:
         encoding = None
     return reader, encoding