diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index f15280755b5..b926d9a967f 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -275,7 +275,7 @@ class TestRetrievingSourceCode(GetSourceBase):
         self.assertEqual(normcase(inspect.getsourcefile(git.abuse)), modfile)
         fn = "_non_existing_filename_used_for_sourcefile_test.py"
         co = compile("None", fn, "exec")
-        self.assertEqual(normcase(inspect.getsourcefile(co)), None)
+        self.assertEqual(inspect.getsourcefile(co), None)
         linecache.cache[co.co_filename] = (1, None, "None", co.co_filename)
         self.assertEqual(normcase(inspect.getsourcefile(co)), fn)