diff --git a/src/components/editable-header.js b/src/components/editable-header.js
index 0b114bc..b2325c6 100644
--- a/src/components/editable-header.js
+++ b/src/components/editable-header.js
@@ -100,7 +100,7 @@ class EditableHeader extends React.Component {
     }
 }
 
-EditableHeader.PropTypes = {
+EditableHeader.propTypes = {
     title: PropTypes.string.isRequired,
     onChange: PropTypes.func
 };