diff --git a/index.js b/index.js
index 50e613e..76bbe3d 100644
--- a/index.js
+++ b/index.js
@@ -926,7 +926,7 @@
 				update:function(){
 					var coord = this.coord;
 					if(!coord.offset){
-						if(this.control.orientation!='undefined'){
+						if(typeof this.control.orientation != 'undefined'){
 							if(!map.get(coord.x+_COS[this.control.orientation],coord.y+_SIN[this.control.orientation])){
 								this.orientation = this.control.orientation;
 							}