diff --git a/Lib/calendar.py b/Lib/calendar.py
index 84aa3a429b4..0301d6b5d6c 100644
--- a/Lib/calendar.py
+++ b/Lib/calendar.py
@@ -636,7 +636,7 @@ def main(args):
     parser.add_option(
         "-e", "--encoding",
         dest="encoding", default=None,
-        help="Encoding to use for output"
+        help="Encoding to use for output."
     )
     parser.add_option(
         "-t", "--type",
@@ -662,10 +662,11 @@ def main(args):
         if encoding is None:
             encoding = sys.getdefaultencoding()
         optdict = dict(encoding=encoding, css=options.css)
+        write = sys.stdout.buffer.write
         if len(args) == 1:
-            print(cal.formatyearpage(datetime.date.today().year, **optdict))
+            write(cal.formatyearpage(datetime.date.today().year, **optdict))
         elif len(args) == 2:
-            print(cal.formatyearpage(int(args[1]), **optdict))
+            write(cal.formatyearpage(int(args[1]), **optdict))
         else:
             parser.error("incorrect number of arguments")
             sys.exit(1)
@@ -687,9 +688,11 @@ def main(args):
         else:
             parser.error("incorrect number of arguments")
             sys.exit(1)
+        write = sys.stdout.write
         if options.encoding:
             result = result.encode(options.encoding)
-        print(result)
+            write = sys.stdout.buffer.write
+        write(result)
 
 
 if __name__ == "__main__":
diff --git a/Lib/test/test_calendar.py b/Lib/test/test_calendar.py
index 4bd758b641e..d3093ac9391 100644
--- a/Lib/test/test_calendar.py
+++ b/Lib/test/test_calendar.py
@@ -2,6 +2,7 @@ import calendar
 import unittest
 
 from test import support
+from test.script_helper import assert_python_ok
 import time
 import locale
 
@@ -451,6 +452,11 @@ class LeapdaysTestCase(unittest.TestCase):
         self.assertEqual(calendar.leapdays(1997,2020), 5)
 
 
+class ConsoleOutputTestCase(unittest.TestCase):
+    def test_outputs_bytes(self):
+        (return_code, stdout, stderr) = assert_python_ok('-m', 'calendar', '--type=html', '2010')
+        self.assertEqual(stdout[:6], b'<?xml ')
+
 def test_main():
     support.run_unittest(
         OutputTestCase,
@@ -460,6 +466,7 @@ def test_main():
         TimegmTestCase,
         MonthRangeTestCase,
         LeapdaysTestCase,
+        ConsoleOutputTestCase
     )
 
 
diff --git a/Misc/NEWS b/Misc/NEWS
index aaeb1b2fc5b..109b4a4e90e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -251,6 +251,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #10087: Fix the html output format of the calendar module.
+
 - Issue #12540: Prevent zombie IDLE processes on Windows due to changes
   in os.kill().