diff --git a/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index 5738aa05434d44..1fb7ef8b887338 100644
--- a/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -407,7 +407,7 @@ async def set_permission(
     ) -> Any:
         params = {"descriptor": descriptor, "state": state, "origin": origin}
         if embedded_origin is not None:
-            params["embeddedOrigin"] = embedded_origin
+            params["embedded_origin"] = embedded_origin
 
         return await self.webdriver.bidi_session.permissions.set_permission(**params)