diff --git a/django/core/management/commands/compilemessages.py b/django/core/management/commands/compilemessages.py
index df188cec84..44e0520b47 100644
--- a/django/core/management/commands/compilemessages.py
+++ b/django/core/management/commands/compilemessages.py
@@ -2,6 +2,7 @@ import codecs
 import concurrent.futures
 import glob
 import os
+from pathlib import Path
 
 from django.core.management.base import BaseCommand, CommandError
 from django.core.management.utils import (
@@ -10,7 +11,7 @@ from django.core.management.utils import (
 
 
 def has_bom(fn):
-    with open(fn, 'rb') as f:
+    with fn.open('rb') as f:
         sample = f.read(4)
     return sample.startswith((codecs.BOM_UTF8, codecs.BOM_UTF16_LE, codecs.BOM_UTF16_BE))
 
@@ -123,7 +124,9 @@ class Command(BaseCommand):
             for i, (dirpath, f) in enumerate(locations):
                 if self.verbosity > 0:
                     self.stdout.write('processing file %s in %s' % (f, dirpath))
-                po_path = os.path.join(dirpath, f)
+                po_path = Path(dirpath) / f
+                mo_path = po_path.with_suffix('.mo')
+
                 if has_bom(po_path):
                     self.stderr.write(
                         'The %s file has a BOM (Byte Order Mark). Django only '
@@ -131,10 +134,9 @@ class Command(BaseCommand):
                     )
                     self.has_errors = True
                     continue
-                base_path = os.path.splitext(po_path)[0]
 
                 # Check writability on first location
-                if i == 0 and not is_writable(base_path + '.mo'):
+                if i == 0 and not is_writable(mo_path):
                     self.stderr.write(
                         'The po files under %s are in a seemingly not writable location. '
                         'mo files will not be updated/created.' % dirpath
@@ -142,9 +144,7 @@ class Command(BaseCommand):
                     self.has_errors = True
                     return
 
-                args = [self.program] + self.program_options + [
-                    '-o', base_path + '.mo', base_path + '.po'
-                ]
+                args = [self.program, *self.program_options, '-o', mo_path, po_path]
                 futures.append(executor.submit(popen_wrapper, args))
 
             for future in concurrent.futures.as_completed(futures):
diff --git a/tests/i18n/test_compilation.py b/tests/i18n/test_compilation.py
index 04958bcbb4..fbacaee221 100644
--- a/tests/i18n/test_compilation.py
+++ b/tests/i18n/test_compilation.py
@@ -34,6 +34,7 @@ class PoFileTests(MessageCompilationTests):
 
     LOCALE = 'es_AR'
     MO_FILE = 'locale/%s/LC_MESSAGES/django.mo' % LOCALE
+    MO_FILE_EN = 'locale/en/LC_MESSAGES/django.mo'
 
     def test_bom_rejection(self):
         stderr = StringIO()
@@ -43,17 +44,17 @@ class PoFileTests(MessageCompilationTests):
         self.assertFalse(os.path.exists(self.MO_FILE))
 
     def test_no_write_access(self):
-        mo_file_en = 'locale/en/LC_MESSAGES/django.mo'
+        mo_file_en = Path(self.MO_FILE_EN)
         err_buffer = StringIO()
-        # put file in read-only mode
-        old_mode = os.stat(mo_file_en).st_mode
-        os.chmod(mo_file_en, stat.S_IREAD)
+        # Put file in read-only mode.
+        old_mode = mo_file_en.stat().st_mode
+        mo_file_en.chmod(stat.S_IREAD)
         try:
             with self.assertRaisesMessage(CommandError, 'compilemessages generated one or more errors.'):
                 call_command('compilemessages', locale=['en'], stderr=err_buffer, verbosity=0)
             self.assertIn('not writable location', err_buffer.getvalue())
         finally:
-            os.chmod(mo_file_en, old_mode)
+            mo_file_en.chmod(old_mode)
 
 
 class PoFileContentsTests(MessageCompilationTests):