diff --git a/examples/webgl_trackballcamera_earth.html b/examples/webgl_trackballcamera_earth.html
index 0ecc03c4..ebda9725 100644
--- a/examples/webgl_trackballcamera_earth.html
+++ b/examples/webgl_trackballcamera_earth.html
@@ -244,8 +244,8 @@
 				camera.aspect = width / height;
 				camera.updateProjectionMatrix();
 
-				camera.screen.width = width;
-				camera.screen.height = height;
+				controls.screen.width = width;
+				controls.screen.height = height;
 
 				camera.radius = ( width + height ) / 4;