diff --git a/lib/index.js b/lib/index.js
index 7750946..b5a9e9a 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,19 +1,18 @@
 var React = require('react');
 
-var component = React.createClass({
-  displayName: 'component',
+export default class Progress extends React.component {
 
-  render: function () {
+  render() {
 
-    var completed = +this.props.completed;
-    if (completed < 0) {
+    const completed = +this.props.completed;
+    if (completed = NaN || completed < 0) {
       completed = 0;
     };
     if (completed > 100) {
       completed = 100;
     };
 
-    var style = {
+    const style = {
       backgroundColor: this.props.color || '#0BD318',
       width: completed + '%',
       transition: "width 200ms",
@@ -30,6 +29,4 @@ var component = React.createClass({
       )
     );
   }
-});
-
-module.exports = component;
\ No newline at end of file
+};
\ No newline at end of file