diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index b9e2fafbc084a6..9caf158019a2ee 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -426,10 +426,11 @@ def _init_posix(vars):
def _init_non_posix(vars):
"""Initialize the module as appropriate for NT"""
# set basic install directories
+ import _imp
vars['LIBDEST'] = get_path('stdlib')
vars['BINLIBDEST'] = get_path('platstdlib')
vars['INCLUDEPY'] = get_path('include')
- vars['EXT_SUFFIX'] = '.pyd'
+ vars['EXT_SUFFIX'] = _imp.extension_suffixes()[0]
vars['EXE'] = '.exe'
vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))
diff --git a/Lib/test/test_sysconfig.py b/Lib/test/test_sysconfig.py
index 44e44bf5ea995f..0ca5c9390dbb9a 100644
--- a/Lib/test/test_sysconfig.py
+++ b/Lib/test/test_sysconfig.py
@@ -358,10 +358,12 @@ def test_SO_value(self):
@unittest.skipIf(sysconfig.get_config_var('EXT_SUFFIX') is None,
'EXT_SUFFIX required for this test')
- def test_SO_in_vars(self):
+ def test_EXT_SUFFIX_in_vars(self):
+ import _imp
vars = sysconfig.get_config_vars()
self.assertIsNotNone(vars['SO'])
self.assertEqual(vars['SO'], vars['EXT_SUFFIX'])
+ self.assertEqual(vars['EXT_SUFFIX'], _imp.extension_suffixes()[0])
@unittest.skipUnless(sys.platform == 'linux' and
hasattr(sys.implementation, '_multiarch'),
diff --git a/Misc/NEWS.d/next/Library/2020-10-20-08-28-26.bpo-39825.n6KnG0.rst b/Misc/NEWS.d/next/Library/2020-10-20-08-28-26.bpo-39825.n6KnG0.rst
new file mode 100644
index 00000000000000..c337731f435843
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-10-20-08-28-26.bpo-39825.n6KnG0.rst
@@ -0,0 +1,5 @@
+Windows: Change ``sysconfig.get_config_var('EXT_SUFFIX')`` to the expected
+full ``platform_tag.extension`` format. Previously it was hard-coded to
+``.pyd``, now it is compatible with ``distutils.sysconfig`` and will result
+in something like ``.cp38-win_amd64.pyd``. This brings windows into
+conformance with the other platforms.
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