--- a/testing/marionette/harness/marionette_harness/tests/unit/test_window_maximize.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_window_maximize.py
@@ -73,18 +73,16 @@ class TestWindowMaximize(MarionetteTestC
     def test_maximize_twice_restores(self):
         maximized = self.marionette.maximize_window()
         self.assert_window_maximized(maximized)
 
         restored = self.marionette.maximize_window()
         self.assert_window_restored(restored)
 
     def test_stress(self):
-        maximized = False
-
         for i in range(1, 25):
             expect_maximized = bool(i % 2)
 
             rect = self.marionette.maximize_window()
             if expect_maximized:
                 self.assert_window_maximized(rect)
             else:
                 self.assert_window_restored(rect)