diff --git a/examples/js/controls/TrackballControls.js b/examples/js/controls/TrackballControls.js
index ed5227a7b2308ea415e6b42b441ee80f5e91e2a3..4add5af511fffc2525c8c99a3c759fab1b883bb3 100644
--- a/examples/js/controls/TrackballControls.js
+++ b/examples/js/controls/TrackballControls.js
@@ -561,12 +561,10 @@ THREE.TrackballControls = function ( object, domElement ) {
 
 			case 0:
 				_state = STATE.NONE;
-				_touchZoomDistanceStart = _touchZoomDistanceEnd = 0;
 				break;
 
 			case 1:
 				_state = STATE.TOUCH_ROTATE;
-				_touchZoomDistanceStart = _touchZoomDistanceEnd = 0;
 				_moveCurr.copy( getMouseOnCircle( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ) );
 				_movePrev.copy( _moveCurr );
 				break;