--- a/testing/marionette/harness/marionette_harness/tests/unit/test_prefs.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_prefs.py
@@ -71,18 +71,18 @@ class TestPreferences(MarionetteTestCase
         self.assertEqual(self.marionette.get_pref(pref_default, default_branch=True),
                          "default_value")
 
         self.marionette.clear_pref(pref_default)
         self.assertEqual(self.marionette.get_pref(pref_default), "default_value")
 
     def test_get_pref_value_type(self):
         # Without a given value type the properties URL will be returned only
-        pref_complex = "browser.startup.homepage"
-        properties_file = "chrome://branding/locale/browserconfig.properties"
+        pref_complex = "browser.menu.showCharacterEncoding"
+        properties_file = "chrome://browser/locale/browser.properties"
         self.assertEqual(self.marionette.get_pref(pref_complex, default_branch=True),
                          properties_file)
 
         # Otherwise the property named like the pref will be translated
         value = self.marionette.get_pref(pref_complex, default_branch=True,
                                          value_type="nsIPrefLocalizedString")
         self.assertNotEqual(value, properties_file)