diff --git a/cubic-bezier.js b/cubic-bezier.js
index 93336f0..2d51efb 100755
--- a/cubic-bezier.js
+++ b/cubic-bezier.js
@@ -25,7 +25,7 @@
 
 var self = window.CubicBezier = function(coordinates) {
 	if (typeof coordinates === 'string') {
-		if(coordinates.indexOf('#') === 0) {
+		if(coordinates[0] === '#') {
 			coordinates = coordinates.slice(1);
 		}