diff --git a/Lib/distutils/tests/test_build_ext.py b/Lib/distutils/tests/test_build_ext.py
index 7e3eafa8ef231e8..5e47e0773a96491 100644
--- a/Lib/distutils/tests/test_build_ext.py
+++ b/Lib/distutils/tests/test_build_ext.py
@@ -312,8 +312,8 @@ def test_unicode_module_names(self):
         dist = Distribution({'name': 'xx', 'ext_modules': modules})
         cmd = self.build_ext(dist)
         cmd.ensure_finalized()
-        self.assertRegex(cmd.get_ext_filename(modules[0].name), r'foo\..*')
-        self.assertRegex(cmd.get_ext_filename(modules[1].name), r'föö\..*')
+        self.assertRegex(cmd.get_ext_filename(modules[0].name), r'foo(_d)?\..*')
+        self.assertRegex(cmd.get_ext_filename(modules[1].name), r'föö(_d)?\..*')
         self.assertEqual(cmd.get_export_symbols(modules[0]), ['PyInit_foo'])
         self.assertEqual(cmd.get_export_symbols(modules[1]), ['PyInitU_f_gkaa'])