diff --git a/examples/js/controls/TrackballControls.js b/examples/js/controls/TrackballControls.js
index c722da3c1a0f7596f27d616a48b9028bc3fca707..5d4582910cf2a2c846ea0904205c70ff8d4b1665 100644
--- a/examples/js/controls/TrackballControls.js
+++ b/examples/js/controls/TrackballControls.js
@@ -475,13 +475,13 @@ THREE.TrackballControls = function ( object, domElement ) {
 
 		switch ( event.deltaMode ) {
 
-                        case 2:
-                                // Zoom in pages
-                                _zoomStart.y -= event.deltaY * 0.025;
-                                break;
+			case 2:
+				// Zoom in pages
+				_zoomStart.y -= event.deltaY * 0.025;
+				break;
 
 			case 1:
-                                // Zoom in lines
+				// Zoom in lines
 				_zoomStart.y -= event.deltaY * 0.01;
 				break;