diff --git a/tests/pefile_test.py b/tests/pefile_test.py
index 361b547..69d358c 100644
--- a/tests/pefile_test.py
+++ b/tests/pefile_test.py
@@ -160,7 +160,7 @@ def test_pe_image_regression_test(self):
     def test_get_rich_header_hash(self):
         """Verify the RICH_HEADER hashes."""
 
-        control_file = os.path.join(REGRESSION_TESTS_DIR, "KERNEL32.DLL")
+        control_file = os.path.join(REGRESSION_TESTS_DIR, "kernel32.dll")
         pe = pefile.PE(control_file)
 
         self.assertEqual(pe.get_rich_header_hash(), "b855b76450d1cd0dc4716bb129962b6d")