diff --git a/packages/core/content-type-builder/admin/src/components/ListRow/DisplayedType.js b/packages/core/content-type-builder/admin/src/components/ListRow/DisplayedType.js
index e74fe0bafb..6b515f9fe1 100644
--- a/packages/core/content-type-builder/admin/src/components/ListRow/DisplayedType.js
+++ b/packages/core/content-type-builder/admin/src/components/ListRow/DisplayedType.js
@@ -49,7 +49,7 @@ DisplayedType.defaultProps = {
 
 DisplayedType.propTypes = {
   type: PropTypes.string.isRequired,
-  customField: PropTypes.bool,
+  customField: PropTypes.string,
   repeatable: PropTypes.bool,
 };