diff --git a/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index a9e1b35efe2c5f..88d55e33a641d0 100644
--- a/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -439,7 +439,7 @@ def setup(self):
     def set_device_posture(self, posture):
         body = {"posture": posture}
         self.logger.debug("JV666 tools/wptrunner/wptrunner/executors/executorwebdriver.py set_device_posture: %s" % posture)
-        return self.webdriver.send_session_command("POST", "window/deviceposture", body)
+        return self.webdriver.send_session_command("POST", "deviceposture", body)
 
 class WebDriverProtocol(Protocol):
     implements = [WebDriverBaseProtocolPart,