diff --git a/lib/RadioButton.js b/lib/RadioButton.js
index 819c1d8..fa0867b 100644
--- a/lib/RadioButton.js
+++ b/lib/RadioButton.js
@@ -11,7 +11,7 @@ export default class RadioButton extends Component {
     static propTypes = {
         label: PropTypes.string,
         theme: PropTypes.oneOf(THEME_NAME),
-        primary: PropTypes.oneOf(PRIMARY_COLORS),
+        primary: PropTypes.oneOfType([PropTypes.oneOf(PRIMARY_COLORS), PropTypes.string]),
         value: PropTypes.oneOfType([PropTypes.string, PropTypes.number]).isRequired,
         checked: PropTypes.bool,
         disabled: PropTypes.bool,
@@ -26,7 +26,7 @@ export default class RadioButton extends Component {
 
     render() {
         const { theme, primary, value, checked, disabled, onSelect } = this.props;
-        const primaryColor = COLOR[`${primary}500`].color;
+        const primaryColor = (COLOR[`${primary}500`] || {}).color || primary;
 
         let status = (()=> {
             if (disabled) {