diff --git a/src/components/close-button/close-button.jsx b/src/components/close-button/close-button.jsx
index 7335dbd11..a72656e6e 100644
--- a/src/components/close-button/close-button.jsx
+++ b/src/components/close-button/close-button.jsx
@@ -4,7 +4,7 @@ const classNames = require('classnames');
 const styles = require('./close-button.css');
 const closeIcon = require('./icon--close.svg');
 
-const CloseButton = (props) => (
+const CloseButton = props => (
     <div
         className={classNames(
             styles.closeButton,
@@ -27,6 +27,7 @@ CloseButton.SIZE_LARGE = 'large';
 CloseButton.SIZE_SMALL = 'small';
 
 CloseButton.propTypes = {
+    className: React.PropTypes.string,
     onClick: React.PropTypes.func,
     size: React.PropTypes.oneOf([CloseButton.SIZE_LARGE, CloseButton.SIZE_SMALL])
 };
@@ -35,4 +36,4 @@ CloseButton.defaultProps = {
     size: CloseButton.SIZE_LARGE
 };
 
-module.exports = CloseButton
+module.exports = CloseButton;