diff --git a/modules/webxr/webxr_interface_js.cpp b/modules/webxr/webxr_interface_js.cpp
index 0b88ca5d6216..c4d2738dc744 100644
--- a/modules/webxr/webxr_interface_js.cpp
+++ b/modules/webxr/webxr_interface_js.cpp
@@ -554,16 +554,9 @@ Vector2 WebXRInterfaceJS::_get_joy_vector_from_axes(int *p_axes) {
 }
 
 Vector2 WebXRInterfaceJS::_get_screen_position_from_joy_vector(const Vector2 &p_joy_vector) {
-	SceneTree *scene_tree = Object::cast_to<SceneTree>(OS::get_singleton()->get_main_loop());
-	if (!scene_tree) {
-		return Vector2();
-	}
-
-	Viewport *viewport = scene_tree->get_root();
-
 	// Invert the y-axis.
 	Vector2 position_percentage((p_joy_vector.x + 1.0f) / 2.0f, ((-p_joy_vector.y) + 1.0f) / 2.0f);
-	Vector2 position = viewport->get_size() * position_percentage;
+	Vector2 position = get_render_targetsize() * position_percentage;
 
 	return position;
 }