diff --git a/testing/web-platform/tests/tools/webdriver/webdriver/client.py b/testing/web-platform/tests/tools/webdriver/webdriver/client.py
index 1f38661dda872479eaf49f43b183f5d6486f8918..993d56a8cc5f979fc0e01f92fce578e1467caefe 100644
--- a/testing/web-platform/tests/tools/webdriver/webdriver/client.py
+++ b/testing/web-platform/tests/tools/webdriver/webdriver/client.py
@@ -263,7 +263,6 @@ class Window(object):
         body = {"x": x, "y": y}
         self.session.send_session_command("POST", "window/rect", body)
 
-    @property
     @command
     def maximize(self):
         return self.session.send_session_command("POST", "window/maximize")