diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index 411aa53..555f598 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -1150,6 +1150,8 @@ def __init__(self, filename, mode='a', encoding=None, delay=False, errors=None):
         self.baseFilename = os.path.abspath(filename)
         self.mode = mode
         self.encoding = encoding
+        if "b" not in mode:
+            self.encoding = io.text_encoding(encoding)
         self.errors = errors
         self.delay = delay
         # bpo-26789: FileHandler keeps a reference to the builtin open()
@@ -2022,8 +2024,10 @@ def basicConfig(**kwargs):
                 filename = kwargs.pop("filename", None)
                 mode = kwargs.pop("filemode", 'a')
                 if filename:
-                    if 'b'in mode:
+                    if 'b' in mode:
                         errors = None
+                    else:
+                        encoding = io.text_encoding(encoding)
                     h = FileHandler(filename, mode,
                                     encoding=encoding, errors=errors)
                 else:
diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index 867ef4e..b0d5885 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -23,7 +23,7 @@
 To use, simply 'import logging.handlers' and log away!
 """
 
-import logging, socket, os, pickle, struct, time, re
+import io, logging, socket, os, pickle, struct, time, re
 from stat import ST_DEV, ST_INO, ST_MTIME
 import queue
 import threading
@@ -150,6 +150,8 @@ def __init__(self, filename, mode='a', maxBytes=0, backupCount=0,
         # on each run.
         if maxBytes > 0:
             mode = 'a'
+        if "b" not in mode:
+            encoding = io.text_encoding(encoding)
         BaseRotatingHandler.__init__(self, filename, mode, encoding=encoding,
                                      delay=delay, errors=errors)
         self.maxBytes = maxBytes
@@ -205,6 +207,7 @@ class TimedRotatingFileHandler(BaseRotatingHandler):
     def __init__(self, filename, when='h', interval=1, backupCount=0,
                  encoding=None, delay=False, utc=False, atTime=None,
                  errors=None):
+        encoding = io.text_encoding(encoding)
         BaseRotatingHandler.__init__(self, filename, 'a', encoding=encoding,
                                      delay=delay, errors=errors)
         self.when = when.upper()
@@ -442,6 +445,8 @@ class WatchedFileHandler(logging.FileHandler):
     """
     def __init__(self, filename, mode='a', encoding=None, delay=False,
                  errors=None):
+        if "b" not in mode:
+            encoding = io.text_encoding(encoding)
         logging.FileHandler.__init__(self, filename, mode=mode,
                                      encoding=encoding, delay=delay,
                                      errors=errors)