diff --git a/addons/knobs/src/components/PropField.js b/addons/knobs/src/components/PropField.js
index 16c04ef35af..a9bf1ac80b6 100644
--- a/addons/knobs/src/components/PropField.js
+++ b/addons/knobs/src/components/PropField.js
@@ -65,6 +65,6 @@ PropField.propTypes = {
   knob: PropTypes.shape({
     name: PropTypes.string,
     value: PropTypes.any,
-  }),
+  }).isRequired,
   onChange: PropTypes.func.isRequired,
 };