diff --git a/chapter-02/01-basic-scene.html b/chapter-02/01-basic-scene.html
index e8606b91..2e4034da 100644
--- a/chapter-02/01-basic-scene.html
+++ b/chapter-02/01-basic-scene.html
@@ -106,9 +106,9 @@
 
 
                 // position the cube randomly in the scene
-                cube.position.x=-30 + Math.round((Math.random() * planeGeometry.width));
+                cube.position.x=-30 + Math.round((Math.random() * (planeGeometry.width||planeGeometry.parameters.width)));
                 cube.position.y= Math.round((Math.random() * 5));
-                cube.position.z=-20 + Math.round((Math.random() * planeGeometry.height));
+                cube.position.z=-20 + Math.round((Math.random() * (planeGeometry.height||planeGeometry.parameters.height)));
 
                 // add the cube to the scene
                 scene.add(cube);
@@ -168,4 +168,4 @@
 
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>