diff --git a/index.js b/index.js
index 2b718ee..c652b6f 100644
--- a/index.js
+++ b/index.js
@@ -50,7 +50,8 @@ const styles = StyleSheet.create({
 });
 
 class PercentageCircle extends Component {
-  propTypes: {
+
+  static propTypes = {
     color: React.PropTypes.string,
     bgcolor: React.PropTypes.string,
     innerColor: React.PropTypes.string,