diff --git a/examples/js/controls/OrbitControls.js b/examples/js/controls/OrbitControls.js
index 773effc4ae928948dda96800f39cb4102981d070..33c98119072642db456eb215bad72750733b5eec 100644
--- a/examples/js/controls/OrbitControls.js
+++ b/examples/js/controls/OrbitControls.js
@@ -509,11 +509,11 @@
 
 				if ( dollyDelta.y > 0 ) {
 
-					contraint.dollyIn( getZoomScale() );
+					constraint.dollyIn( getZoomScale() );
 
 				} else if ( dollyDelta.y < 0 ) {
 
-					contraint.dollyOut( getZoomScale() );
+					constraint.dollyOut( getZoomScale() );
 
 				}